20905125 has 32 divisors (see below), whose sum is σ = 35178624. Its totient is φ = 11024000.

The previous prime is 20905117. The next prime is 20905133. The reversal of 20905125 is 52150902.

It is an interprime number because it is at equal distance from previous prime (20905117) and next prime (20905133).

It is not a de Polignac number, because 20905125 - 2³ = 20905117 is a prime.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20905095 and 20905104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39865 + ... + 40385.

It is an arithmetic number, because the mean of its divisors is an integer number (1099332).

Almost surely, 2^20905125 is an apocalyptic number.

20905125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20905125 is a deficient number, since it is larger than the sum of its proper divisors (14273499).

20905125 is a wasteful number, since it uses less digits than its factorization.

20905125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 20905125 is about 4572.2122654138. The cubic root of 20905125 is about 275.4763095253.

The spelling of 20905125 in words is "twenty million, nine hundred five thousand, one hundred twenty-five".