20888497 has 16 divisors (see below), whose sum is σ = 25280640. Its totient is φ = 16877952.

The previous prime is 20888489. The next prime is 20888509. The reversal of 20888497 is 79488802.

It is not a de Polignac number, because 20888497 - 2³ = 20888489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20888477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7533 + ... + 9925.

It is an arithmetic number, because the mean of its divisors is an integer number (1580040).

Almost surely, 2^20888497 is an apocalyptic number.

It is an amenable number.

20888497 is a deficient number, since it is larger than the sum of its proper divisors (4392143).

20888497 is a wasteful number, since it uses less digits than its factorization.

20888497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2472.

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 20888497 is about 4570.3935279142. The cubic root of 20888497 is about 275.4032519204.

It can be divided in two parts, 208884 and 97, that added together give a triangular number (208981 = T₆₄₆).

The spelling of 20888497 in words is "twenty million, eight hundred eighty-eight thousand, four hundred ninety-seven".