20939725 has 24 divisors (see below), whose sum is σ = 27498240. Its totient is φ = 15792000.

The previous prime is 20939719. The next prime is 20939731. The reversal of 20939725 is 52793902.

It is an interprime number because it is at equal distance from previous prime (20939719) and next prime (20939731).

It is not a de Polignac number, because 20939725 - 2⁹ = 20939213 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31446 + ... + 32104.

It is an arithmetic number, because the mean of its divisors is an integer number (1145760).

Almost surely, 2^20939725 is an apocalyptic number.

20939725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20939725 is a deficient number, since it is larger than the sum of its proper divisors (6558515).

20939725 is a wasteful number, since it uses less digits than its factorization.

20939725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741 (or 736 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 20939725 is about 4575.9944274442. The cubic root of 20939725 is about 275.6282057172.

The spelling of 20939725 in words is "twenty million, nine hundred thirty-nine thousand, seven hundred twenty-five".