20645563324 has 24 divisors (see below), whose sum is σ = 39684839040. Its totient is φ = 9354281904.

The previous prime is 20645563319. The next prime is 20645563327. The reversal of 20645563324 is 42336554602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20645563327) 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, 5903734 + ... + 5907229.

It is an arithmetic number, because the mean of its divisors is an integer number (1653534960).

Almost surely, 2^20645563324 is an apocalyptic number.

It is an amenable number.

20645563324 is a deficient number, since it is larger than the sum of its proper divisors (19039275716).

20645563324 is a wasteful number, since it uses less digits than its factorization.

20645563324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11811009 (or 11811007 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 40.

The spelling of 20645563324 in words is "twenty billion, six hundred forty-five million, five hundred sixty-three thousand, three hundred twenty-four".