20011531204 has 18 divisors (see below), whose sum is σ = 40737760350. Its totient is φ = 8576370432.

The previous prime is 20011531157. The next prime is 20011531279. The reversal of 20011531204 is 40213511002.

It can be written as a sum of positive squares in only one way, i.e., 16077732804 + 3933798400 = 126798^2 + 62720^2 .

It is a super-2 number, since 2×20011531204² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 51049629 + ... + 51050020.

Almost surely, 2^20011531204 is an apocalyptic number.

It is an amenable number.

20011531204 is an abundant number, since it is smaller than the sum of its proper divisors (20726229146).

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

20011531204 is a wasteful number, since it uses less digits than its factorization.

20011531204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102099667 (or 102099658 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The spelling of 20011531204 in words is "twenty billion, eleven million, five hundred thirty-one thousand, two hundred four".