20359491 has 16 divisors (see below), whose sum is σ = 27744000. Its totient is φ = 13277088.

The previous prime is 20359487. The next prime is 20359513. The reversal of 20359491 is 19495302.

It is not a de Polignac number, because 20359491 - 2² = 20359487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20359441) 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, 39745 + ... + 40253.

It is an arithmetic number, because the mean of its divisors is an integer number (1734000).

Almost surely, 2^20359491 is an apocalyptic number.

20359491 is a deficient number, since it is larger than the sum of its proper divisors (7384509).

20359491 is a wasteful number, since it uses less digits than its factorization.

20359491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 20359491 is about 4512.1492661480. The cubic root of 20359491 is about 273.0584613626.

The spelling of 20359491 in words is "twenty million, three hundred fifty-nine thousand, four hundred ninety-one".