20391296460 has 48 divisors (see below), whose sum is σ = 57512409696. Its totient is φ = 5397985792.

The previous prime is 20391296449. The next prime is 20391296473. The reversal of 20391296460 is 6469219302.

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, 1232127 + ... + 1248566.

It is an arithmetic number, because the mean of its divisors is an integer number (1198175202).

Almost surely, 2^20391296460 is an apocalyptic number.

20391296460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20391296460 is an abundant number, since it is smaller than the sum of its proper divisors (37121113236).

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

20391296460 is a wasteful number, since it uses less digits than its factorization.

20391296460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2480842 (or 2480840 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 42.

The spelling of 20391296460 in words is "twenty billion, three hundred ninety-one million, two hundred ninety-six thousand, four hundred sixty".