20401303220 has 24 divisors (see below), whose sum is σ = 45362898504. Its totient is φ = 7680490496.

The previous prime is 20401303217. The next prime is 20401303261. The reversal of 20401303220 is 2230310402.

It can be written as a sum of positive squares in 4 ways, for example, as 4471329424 + 15929973796 = 66868^2 + 126214^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 30001577 + ... + 30002256.

It is an arithmetic number, because the mean of its divisors is an integer number (1890120771).

Almost surely, 2^20401303220 is an apocalyptic number.

20401303220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20401303220 is an abundant number, since it is smaller than the sum of its proper divisors (24961595284).

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

20401303220 is a wasteful number, since it uses less digits than its factorization.

20401303220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60003859 (or 60003857 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 20401303220 its reverse (2230310402), we get a palindrome (22631613622).

The spelling of 20401303220 in words is "twenty billion, four hundred one million, three hundred three thousand, two hundred twenty".