20641623620 has 24 divisors (see below), whose sum is σ = 43355691288. Its totient is φ = 8255072000.

The previous prime is 20641623599. The next prime is 20641623623. The reversal of 20641623620 is 2632614602.

It can be written as a sum of positive squares in 4 ways, for example, as 327392836 + 20314230784 = 18094^2 + 142528^2 .

It is not an unprimeable number, because it can be changed into a prime (20641623623) 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, 11720 + ... + 203520.

It is an arithmetic number, because the mean of its divisors is an integer number (1806487137).

Almost surely, 2^20641623620 is an apocalyptic number.

20641623620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20641623620 is an abundant number, since it is smaller than the sum of its proper divisors (22714067668).

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

20641623620 is a wasteful number, since it uses less digits than its factorization.

20641623620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197191 (or 197189 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The spelling of 20641623620 in words is "twenty billion, six hundred forty-one million, six hundred twenty-three thousand, six hundred twenty".