20359391 has 4 divisors (see below), whose sum is σ = 21925512. Its totient is φ = 18793272.

The previous prime is 20359337. The next prime is 20359441. The reversal of 20359391 is 19395302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20359391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20359091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 783041 + ... + 783066.

It is an arithmetic number, because the mean of its divisors is an integer number (5481378).

Almost surely, 2^20359391 is an apocalyptic number.

20359391 is a deficient number, since it is larger than the sum of its proper divisors (1566121).

20359391 is a wasteful number, since it uses less digits than its factorization.

20359391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566120.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 20359391 is about 4512.1381849407. The cubic root of 20359391 is about 273.0580143002.

The spelling of 20359391 in words is "twenty million, three hundred fifty-nine thousand, three hundred ninety-one".