20812661650 has 48 divisors (see below), whose sum is σ = 42618343680. Its totient is φ = 7498785600.

The previous prime is 20812661633. The next prime is 20812661651. The reversal of 20812661650 is 5616621802.

It is not an unprimeable number, because it can be changed into a prime (20812661651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 113634 + ... + 233533.

It is an arithmetic number, because the mean of its divisors is an integer number (887882160).

Almost surely, 2^20812661650 is an apocalyptic number.

20812661650 is an abundant number, since it is smaller than the sum of its proper divisors (21805682030).

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

20812661650 is a wasteful number, since it uses less digits than its factorization.

20812661650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347299 (or 347294 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 20812661650 in words is "twenty billion, eight hundred twelve million, six hundred sixty-one thousand, six hundred fifty".