20491596 has 48 divisors (see below), whose sum is σ = 56256480. Its totient is φ = 6428160.

The previous prime is 20491591. The next prime is 20491609. The reversal of 20491596 is 69519402.

20491596 is a `hidden beast` number, since 20 + 49 + 1 + 596 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20491596.

It is not an unprimeable number, because it can be changed into a prime (20491591) 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, 3745 + ... + 7416.

It is an arithmetic number, because the mean of its divisors is an integer number (1172010).

Almost surely, 2^20491596 is an apocalyptic number.

It is an amenable number.

20491596 is an abundant number, since it is smaller than the sum of its proper divisors (35764884).

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

20491596 is a wasteful number, since it uses less digits than its factorization.

20491596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11191 (or 11183 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 20491596 is about 4526.7644073886. The cubic root of 20491596 is about 273.6477794365.

The spelling of 20491596 in words is "twenty million, four hundred ninety-one thousand, five hundred ninety-six".