20887700 has 18 divisors (see below), whose sum is σ = 45326526. Its totient is φ = 8355040.

The previous prime is 20887687. The next prime is 20887733. The reversal of 20887700 is 778802.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4468996 + 16418704 = 2114^2 + 4052^2 .

It is a super-2 number, since 2×20887700² = 872592022580000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 104339 + ... + 104538.

Almost surely, 2^20887700 is an apocalyptic number.

20887700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20887700 is an abundant number, since it is smaller than the sum of its proper divisors (24438826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20887700 is a wasteful number, since it uses less digits than its factorization.

20887700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208891 (or 208884 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 20887700 is about 4570.3063354659. The cubic root of 20887700 is about 275.3997492081.

The spelling of 20887700 in words is "twenty million, eight hundred eighty-seven thousand, seven hundred".