20987092 has 18 divisors (see below), whose sum is σ = 42724122. Its totient is φ = 8994384.

The previous prime is 20987089. The next prime is 20987119. The reversal of 20987092 is 29078902.

It can be written as a sum of positive squares in only one way, i.e., 16032016 + 4955076 = 4004^2 + 2226^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53343 + ... + 53734.

Almost surely, 2^20987092 is an apocalyptic number.

It is an amenable number.

20987092 is an abundant number, since it is smaller than the sum of its proper divisors (21737030).

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

20987092 is a wasteful number, since it uses less digits than its factorization.

20987092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107095 (or 107086 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 20987092 is about 4581.1671002049. The cubic root of 20987092 is about 275.8358787614.

The spelling of 20987092 in words is "twenty million, nine hundred eighty-seven thousand, ninety-two".