20398651804 has 12 divisors (see below), whose sum is σ = 35699743800. Its totient is φ = 10198725008.

The previous prime is 20398651771. The next prime is 20398651817. The reversal of 20398651804 is 40815689302.

It is a super-2 number, since 2×20398651804² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68959 + ... + 213430.

It is an arithmetic number, because the mean of its divisors is an integer number (2974978650).

Almost surely, 2^20398651804 is an apocalyptic number.

It is an amenable number.

20398651804 is a deficient number, since it is larger than the sum of its proper divisors (15301091996).

20398651804 is a wasteful number, since it uses less digits than its factorization.

20398651804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300452 (or 300450 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 20398651804 in words is "twenty billion, three hundred ninety-eight million, six hundred fifty-one thousand, eight hundred four".