20643321624 has 16 divisors (see below), whose sum is σ = 51608304120. Its totient is φ = 6881107200.

The previous prime is 20643321619. The next prime is 20643321637. The reversal of 20643321624 is 42612334602.

It is a super-2 number, since 2×20643321624² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 430069177 + ... + 430069224.

Almost surely, 2^20643321624 is an apocalyptic number.

20643321624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20643321624 is an abundant number, since it is smaller than the sum of its proper divisors (30964982496).

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

20643321624 is a wasteful number, since it uses less digits than its factorization.

20643321624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860138410 (or 860138406 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 33.

The spelling of 20643321624 in words is "twenty billion, six hundred forty-three million, three hundred twenty-one thousand, six hundred twenty-four".