20403311220 has 36 divisors (see below), whose sum is σ = 61890044580. Its totient is φ = 5440882944.

The previous prime is 20403311219. The next prime is 20403311221. The reversal of 20403311220 is 2211330402.

It is an interprime number because it is at equal distance from previous prime (20403311219) and next prime (20403311221).

It can be written as a sum of positive squares in 2 ways, for example, as 15729674724 + 4673636496 = 125418^2 + 68364^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20403311193 and 20403311202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20403311221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56675685 + ... + 56676044.

It is an arithmetic number, because the mean of its divisors is an integer number (1719167905).

Almost surely, 2^20403311220 is an apocalyptic number.

20403311220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20403311220 is an abundant number, since it is smaller than the sum of its proper divisors (41486733360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20403311220 is a wasteful number, since it uses less digits than its factorization.

20403311220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113351744 (or 113351739 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20403311220 its reverse (2211330402), we get a palindrome (22614641622).

The spelling of 20403311220 in words is "twenty billion, four hundred three million, three hundred eleven thousand, two hundred twenty".