20645646324 has 24 divisors (see below), whose sum is σ = 48480014688. Its totient is φ = 6838047840.

The previous prime is 20645646323. The next prime is 20645646353. The reversal of 20645646324 is 42364654602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645646323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5477322 + ... + 5481089.

It is an arithmetic number, because the mean of its divisors is an integer number (2020000612).

Almost surely, 2^20645646324 is an apocalyptic number.

It is an amenable number.

20645646324 is an abundant number, since it is smaller than the sum of its proper divisors (27834368364).

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

20645646324 is a wasteful number, since it uses less digits than its factorization.

20645646324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10958575 (or 10958573 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 42.

The spelling of 20645646324 in words is "twenty billion, six hundred forty-five million, six hundred forty-six thousand, three hundred twenty-four".