20021500025 has 12 divisors (see below), whose sum is σ = 24876032832. Its totient is φ = 15985346640.

The previous prime is 20021500007. The next prime is 20021500063. The reversal of 20021500025 is 52000512002.

It is not a de Polignac number, because 20021500025 - 2⁶ = 20021499961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021499976 and 20021500012.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 783509 + ... + 808658.

It is an arithmetic number, because the mean of its divisors is an integer number (2073002736).

Almost surely, 2^20021500025 is an apocalyptic number.

20021500025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20021500025 is a deficient number, since it is larger than the sum of its proper divisors (4854532807).

20021500025 is a wasteful number, since it uses less digits than its factorization.

20021500025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1592680 (or 1592675 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The spelling of 20021500025 in words is "twenty billion, twenty-one million, five hundred thousand, twenty-five".