20968604646 has 32 divisors (see below), whose sum is σ = 45781815168. Its totient is φ = 6349659840.

The previous prime is 20968604641. The next prime is 20968604651. The reversal of 20968604646 is 64640686902.

It is an interprime number because it is at equal distance from previous prime (20968604641) and next prime (20968604651).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20968604641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16276 + ... + 205431.

It is an arithmetic number, because the mean of its divisors is an integer number (1430681724).

Almost surely, 2^20968604646 is an apocalyptic number.

20968604646 is an abundant number, since it is smaller than the sum of its proper divisors (24813210522).

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

20968604646 is a wasteful number, since it uses less digits than its factorization.

20968604646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223156.

The product of its (nonzero) digits is 2985984, while the sum is 51.

The spelling of 20968604646 in words is "twenty billion, nine hundred sixty-eight million, six hundred four thousand, six hundred forty-six".