20725887 has 48 divisors (see below), whose sum is σ = 35589120. Its totient is φ = 10445760.

The previous prime is 20725867. The next prime is 20725889. The reversal of 20725887 is 78852702.

It is not a de Polignac number, because 20725887 - 2⁸ = 20725631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20725889) 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 47 ways as a sum of consecutive naturals, for example, 262314 + ... + 262392.

It is an arithmetic number, because the mean of its divisors is an integer number (741440).

Almost surely, 2^20725887 is an apocalyptic number.

20725887 is a deficient number, since it is larger than the sum of its proper divisors (14863233).

20725887 is a wasteful number, since it uses less digits than its factorization.

20725887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 20725887 is about 4552.5692745965. The cubic root of 20725887 is about 274.6867485461.

It can be divided in two parts, 20725 and 887, that added together give a palindrome (21612).

The spelling of 20725887 in words is "twenty million, seven hundred twenty-five thousand, eight hundred eighty-seven".