20868025 has 6 divisors (see below), whose sum is σ = 25876382. Its totient is φ = 16694400.

The previous prime is 20868019. The next prime is 20868059. The reversal of 20868025 is 52086802.

It can be written as a sum of positive squares in 3 ways, for example, as 110889 + 20757136 = 333^2 + 4556^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20868025 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 417336 + ... + 417385.

Almost surely, 2^20868025 is an apocalyptic number.

20868025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20868025 is a deficient number, since it is larger than the sum of its proper divisors (5008357).

20868025 is an equidigital number, since it uses as much as digits as its factorization.

20868025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834731 (or 834726 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 20868025 is about 4568.1533468131. The cubic root of 20868025 is about 275.3132518555.

The spelling of 20868025 in words is "twenty million, eight hundred sixty-eight thousand, twenty-five".