20881497 has 40 divisors (see below), whose sum is σ = 35135744. Its totient is φ = 10965024.

The previous prime is 20881477. The next prime is 20881501. The reversal of 20881497 is 79418802.

It is not a de Polignac number, because 20881497 - 2⁶ = 20881433 is a prime.

It is a super-2 number, since 2×20881497² = 872073833922018, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (20881477) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 93528 + ... + 93750.

Almost surely, 2^20881497 is an apocalyptic number.

It is an amenable number.

20881497 is a deficient number, since it is larger than the sum of its proper divisors (14254247).

20881497 is an equidigital number, since it uses as much as digits as its factorization.

20881497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 20881497 is about 4569.6276653574. The cubic root of 20881497 is about 275.3724847769.

The spelling of 20881497 in words is "twenty million, eight hundred eighty-one thousand, four hundred ninety-seven".