20885988 has 12 divisors (see below), whose sum is σ = 48734000. Its totient is φ = 6961992.

The previous prime is 20885987. The next prime is 20885989. The reversal of 20885988 is 88958802.

It is an interprime number because it is at equal distance from previous prime (20885987) and next prime (20885989).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×20885988² = 872448989472288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20885981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 870238 + ... + 870261.

Almost surely, 2^20885988 is an apocalyptic number.

It is an amenable number.

20885988 is an abundant number, since it is smaller than the sum of its proper divisors (27848012).

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

20885988 is a wasteful number, since it uses less digits than its factorization.

20885988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740506 (or 1740504 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 48.

The square root of 20885988 is about 4570.1190356489. The cubic root of 20885988 is about 275.3922248875.

The spelling of 20885988 in words is "twenty million, eight hundred eighty-five thousand, nine hundred eighty-eight".