20645646294 has 64 divisors (see below), whose sum is σ = 53809491456. Its totient is φ = 5124708864.

The previous prime is 20645646293. The next prime is 20645646313. The reversal of 20645646294 is 49264654602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645646293) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1102852 + ... + 1121415.

It is an arithmetic number, because the mean of its divisors is an integer number (840773304).

Almost surely, 2^20645646294 is an apocalyptic number.

20645646294 is an abundant number, since it is smaller than the sum of its proper divisors (33163845162).

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

20645646294 is a wasteful number, since it uses less digits than its factorization.

20645646294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2224309.

The product of its (nonzero) digits is 2488320, while the sum is 48.

The spelling of 20645646294 in words is "twenty billion, six hundred forty-five million, six hundred forty-six thousand, two hundred ninety-four".