20425887 has 12 divisors (see below), whose sum is σ = 30301960. Its totient is φ = 13249008.

The previous prime is 20425883. The next prime is 20425897. The reversal of 20425887 is 78852402.

It is a happy number.

It is not a de Polignac number, because 20425887 - 2² = 20425883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20425883) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30337 + ... + 31002.

Almost surely, 2^20425887 is an apocalyptic number.

20425887 is a deficient number, since it is larger than the sum of its proper divisors (9876073).

20425887 is a wasteful number, since it uses less digits than its factorization.

20425887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61382 (or 61379 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 20425887 is about 4519.5007467640. The cubic root of 20425887 is about 273.3549703607.

It can be divided in two parts, 20425 and 887, that added together give a palindrome (21312).

The spelling of 20425887 in words is "twenty million, four hundred twenty-five thousand, eight hundred eighty-seven".