20634825 has 12 divisors (see below), whose sum is σ = 34116368. Its totient is φ = 11005200.

The previous prime is 20634799. The next prime is 20634851. The reversal of 20634825 is 52843602.

It is an interprime number because it is at equal distance from previous prime (20634799) and next prime (20634851).

It is not a de Polignac number, because 20634825 - 2⁵ = 20634793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20634792 and 20634801.

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, 137491 + ... + 137640.

Almost surely, 2^20634825 is an apocalyptic number.

20634825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20634825 is a deficient number, since it is larger than the sum of its proper divisors (13481543).

20634825 is a wasteful number, since it uses less digits than its factorization.

20634825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275144 (or 275139 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 20634825 is about 4542.5570992559. The cubic root of 20634825 is about 274.2838667488.

The spelling of 20634825 in words is "twenty million, six hundred thirty-four thousand, eight hundred twenty-five".