20597919 has 16 divisors (see below), whose sum is σ = 29844480. Its totient is φ = 12588480.

The previous prime is 20597887. The next prime is 20597933. The reversal of 20597919 is 91979502.

It is not a de Polignac number, because 20597919 - 2⁵ = 20597887 is a prime.

It is a super-2 number, since 2×20597919² = 848548534261122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20597119) 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, 4062 + ... + 7595.

It is an arithmetic number, because the mean of its divisors is an integer number (1865280).

Almost surely, 2^20597919 is an apocalyptic number.

20597919 is a deficient number, since it is larger than the sum of its proper divisors (9246561).

20597919 is a wasteful number, since it uses less digits than its factorization.

20597919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11710.

The product of its (nonzero) digits is 51030, while the sum is 42.

The square root of 20597919 is about 4538.4930318334. The cubic root of 20597919 is about 274.1202475384.

The spelling of 20597919 in words is "twenty million, five hundred ninety-seven thousand, nine hundred nineteen".