20624985 has 12 divisors (see below), whose sum is σ = 35750052. Its totient is φ = 10999968.

The previous prime is 20624977. The next prime is 20624987. The reversal of 20624985 is 58942602.

It is a happy number.

20624985 is a `hidden beast` number, since 20 + 624 + 9 + 8 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16451136 + 4173849 = 4056^2 + 2043^2 .

It is not a de Polignac number, because 20624985 - 2³ = 20624977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20624987) 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, 229122 + ... + 229211.

It is an arithmetic number, because the mean of its divisors is an integer number (2979171).

Almost surely, 2^20624985 is an apocalyptic number.

It is an amenable number.

20624985 is a deficient number, since it is larger than the sum of its proper divisors (15125067).

20624985 is a wasteful number, since it uses less digits than its factorization.

20624985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458344 (or 458341 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 20624985 is about 4541.4738797003. The cubic root of 20624985 is about 274.2402611391.

It can be divided in two parts, 20624 and 985, that added together give a square (21609 = 147²).

The spelling of 20624985 in words is "twenty million, six hundred twenty-four thousand, nine hundred eighty-five".