20725587 has 24 divisors (see below), whose sum is σ = 31082480. Its totient is φ = 13296960.

The previous prime is 20725547. The next prime is 20725589. The reversal of 20725587 is 78552702.

20725587 is a `hidden beast` number, since 2 + 0 + 72 + 5 + 587 = 666.

It is not a de Polignac number, because 20725587 - 2¹⁰ = 20724563 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20725589) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36012 + ... + 36582.

Almost surely, 2^20725587 is an apocalyptic number.

20725587 is a deficient number, since it is larger than the sum of its proper divisors (10356893).

20725587 is a wasteful number, since it uses less digits than its factorization.

20725587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723 (or 720 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 20725587 is about 4552.5363260495. The cubic root of 20725587 is about 274.6854232080.

It can be divided in two parts, 20725 and 587, that added together give a palindrome (21312).

The spelling of 20725587 in words is "twenty million, seven hundred twenty-five thousand, five hundred eighty-seven".