20690725 has 12 divisors (see below), whose sum is σ = 27989280. Its totient is φ = 15047600.

The previous prime is 20690701. The next prime is 20690737. The reversal of 20690725 is 52709602.

It is not a de Polignac number, because 20690725 - 2⁵ = 20690693 is a prime.

It is a super-2 number, since 2×20690725² = 856212202051250, which contains 22 as substring.

It is a congruent number.

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, 37345 + ... + 37894.

It is an arithmetic number, because the mean of its divisors is an integer number (2332440).

Almost surely, 2^20690725 is an apocalyptic number.

20690725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20690725 is a deficient number, since it is larger than the sum of its proper divisors (7298555).

20690725 is a wasteful number, since it uses less digits than its factorization.

20690725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75260 (or 75255 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 20690725 is about 4548.7058599122. The cubic root of 20690725 is about 274.5313229087.

The spelling of 20690725 in words is "twenty million, six hundred ninety thousand, seven hundred twenty-five".