20949625 has 8 divisors (see below), whose sum is σ = 26145288. Its totient is φ = 16759600.

The previous prime is 20949611. The next prime is 20949631. The reversal of 20949625 is 52694902.

It can be written as a sum of positive squares in 4 ways, for example, as 2742336 + 18207289 = 1656^2 + 4267^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20949625 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83674 + ... + 83923.

It is an arithmetic number, because the mean of its divisors is an integer number (3268161).

Almost surely, 2^20949625 is an apocalyptic number.

20949625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20949625 is a deficient number, since it is larger than the sum of its proper divisors (5195663).

20949625 is an equidigital number, since it uses as much as digits as its factorization.

20949625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167612 (or 167602 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 20949625 is about 4577.0760317041. The cubic root of 20949625 is about 275.6716365536.

The spelling of 20949625 in words is "twenty million, nine hundred forty-nine thousand, six hundred twenty-five".