20730644025 has 96 divisors (see below), whose sum is σ = 42763096320. Its totient is φ = 8627834880.

The previous prime is 20730643991. The next prime is 20730644029. The reversal of 20730644025 is 52044603702.

It is not a de Polignac number, because 20730644025 - 2⁹ = 20730643513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20730644029) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 477421 + ... + 519029.

It is an arithmetic number, because the mean of its divisors is an integer number (445448920).

Almost surely, 2^20730644025 is an apocalyptic number.

20730644025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20730644025 is an abundant number, since it is smaller than the sum of its proper divisors (22032452295).

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

20730644025 is a wasteful number, since it uses less digits than its factorization.

20730644025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41715 (or 41710 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 33.

The spelling of 20730644025 in words is "twenty billion, seven hundred thirty million, six hundred forty-four thousand, twenty-five".