20400312204 has 72 divisors (see below), whose sum is σ = 52164337680. Its totient is φ = 6721823232.

The previous prime is 20400312169. The next prime is 20400312221. The reversal of 20400312204 is 40221300402.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1157184 + ... + 1174680.

It is an arithmetic number, because the mean of its divisors is an integer number (724504690).

Almost surely, 2^20400312204 is an apocalyptic number.

It is an amenable number.

20400312204 is an abundant number, since it is smaller than the sum of its proper divisors (31764025476).

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

20400312204 is a wasteful number, since it uses less digits than its factorization.

20400312204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17879 (or 17874 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 20400312204 its reverse (40221300402), we get a palindrome (60621612606).

The spelling of 20400312204 in words is "twenty billion, four hundred million, three hundred twelve thousand, two hundred four".