20531213412 has 48 divisors (see below), whose sum is σ = 51583936320. Its totient is φ = 6331988992.

The previous prime is 20531213387. The next prime is 20531213431. The reversal of 20531213412 is 21431213502.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 840873 + ... + 864944.

It is an arithmetic number, because the mean of its divisors is an integer number (1074665340).

Almost surely, 2^20531213412 is an apocalyptic number.

It is an amenable number.

20531213412 is an abundant number, since it is smaller than the sum of its proper divisors (31052722908).

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

20531213412 is a wasteful number, since it uses less digits than its factorization.

20531213412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1705900 (or 1705898 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 20531213412 its reverse (21431213502), we get a palindrome (41962426914).

The spelling of 20531213412 in words is "twenty billion, five hundred thirty-one million, two hundred thirteen thousand, four hundred twelve".