20988597 has 32 divisors (see below), whose sum is σ = 34513920. Its totient is φ = 11076480.

The previous prime is 20988593. The next prime is 20988599. The reversal of 20988597 is 79588902.

It is a happy number.

It is not a de Polignac number, because 20988597 - 2² = 20988593 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20988593) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15718 + ... + 17000.

It is an arithmetic number, because the mean of its divisors is an integer number (1078560).

Almost surely, 2^20988597 is an apocalyptic number.

It is an amenable number.

20988597 is a deficient number, since it is larger than the sum of its proper divisors (13525323).

20988597 is a wasteful number, since it uses less digits than its factorization.

20988597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353.

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 20988597 is about 4581.3313567128. The cubic root of 20988597 is about 275.8424720693.

The spelling of 20988597 in words is "twenty million, nine hundred eighty-eight thousand, five hundred ninety-seven".