20651425 has 12 divisors (see below), whose sum is σ = 26434816. Its totient is φ = 15987600.

The previous prime is 20651419. The next prime is 20651429. The reversal of 20651425 is 52415602.

It is not a de Polignac number, because 20651425 - 2⁷ = 20651297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 20651425.

It is not an unprimeable number, because it can be changed into a prime (20651429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12549 + ... + 14098.

Almost surely, 2^20651425 is an apocalyptic number.

20651425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20651425 is a deficient number, since it is larger than the sum of its proper divisors (5783391).

20651425 is a wasteful number, since it uses less digits than its factorization.

20651425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26688 (or 26683 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 20651425 is about 4544.3838966355. The cubic root of 20651425 is about 274.3573976493.

The spelling of 20651425 in words is "twenty million, six hundred fifty-one thousand, four hundred twenty-five".