20647877292 has 48 divisors (see below), whose sum is σ = 61178897920. Its totient is φ = 5899393296.

The previous prime is 20647877249. The next prime is 20647877309. The reversal of 20647877292 is 29277874602.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13655248 + ... + 13656759.

Almost surely, 2^20647877292 is an apocalyptic number.

It is an amenable number.

20647877292 is an abundant number, since it is smaller than the sum of its proper divisors (40531020628).

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

20647877292 is a wasteful number, since it uses less digits than its factorization.

20647877292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27312027 (or 27312019 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 54.

The spelling of 20647877292 in words is "twenty billion, six hundred forty-seven million, eight hundred seventy-seven thousand, two hundred ninety-two".