20402341220 has 24 divisors (see below), whose sum is σ = 43361123904. Its totient is φ = 8062611296.

The previous prime is 20402341171. The next prime is 20402341241. The reversal of 20402341220 is 2214320402.

It is a super-2 number, since 2×20402341220² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20402341192 and 20402341201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6143624 + ... + 6146943.

It is an arithmetic number, because the mean of its divisors is an integer number (1806713496).

Almost surely, 2^20402341220 is an apocalyptic number.

20402341220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20402341220 is an abundant number, since it is smaller than the sum of its proper divisors (22958782684).

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

20402341220 is a wasteful number, since it uses less digits than its factorization.

20402341220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12290659 (or 12290657 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20402341220 its reverse (2214320402), we get a palindrome (22616661622).

The spelling of 20402341220 in words is "twenty billion, four hundred two million, three hundred forty-one thousand, two hundred twenty".