20685460650 has 48 divisors (see below), whose sum is σ = 51398225184. Its totient is φ = 5505554880.

The previous prime is 20685460561. The next prime is 20685460687. The reversal of 20685460650 is 5606458602.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53389 + ... + 210288.

It is an arithmetic number, because the mean of its divisors is an integer number (1070796358).

Almost surely, 2^20685460650 is an apocalyptic number.

20685460650 is an abundant number, since it is smaller than the sum of its proper divisors (30712764534).

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

20685460650 is a wasteful number, since it uses less digits than its factorization.

20685460650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264215 (or 264210 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 20685460650 in words is "twenty billion, six hundred eighty-five million, four hundred sixty thousand, six hundred fifty".