20400220232 has 32 divisors (see below), whose sum is σ = 44048473920. Its totient is φ = 8676208320.

The previous prime is 20400220223. The next prime is 20400220237. The reversal of 20400220232 is 23202200402.

It is a self number, because there is not a number n which added to its sum of digits gives 20400220232.

It is not an unprimeable number, because it can be changed into a prime (20400220237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1383083 + ... + 1397754.

It is an arithmetic number, because the mean of its divisors is an integer number (1376514810).

Almost surely, 2^20400220232 is an apocalyptic number.

It is an amenable number.

20400220232 is an abundant number, since it is smaller than the sum of its proper divisors (23648253688).

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

20400220232 is a wasteful number, since it uses less digits than its factorization.

20400220232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2780981 (or 2780977 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

Adding to 20400220232 its reverse (23202200402), we get a palindrome (43602420634).

The spelling of 20400220232 in words is "twenty billion, four hundred million, two hundred twenty thousand, two hundred thirty-two".