20215959 has 8 divisors (see below), whose sum is σ = 26977152. Its totient is φ = 13466040.

The previous prime is 20215883. The next prime is 20215967. The reversal of 20215959 is 95951202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20215959 - 2¹⁹ = 19691671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3214 + ... + 7124.

It is an arithmetic number, because the mean of its divisors is an integer number (3372144).

Almost surely, 2^20215959 is an apocalyptic number.

20215959 is a deficient number, since it is larger than the sum of its proper divisors (6761193).

20215959 is a wasteful number, since it uses less digits than its factorization.

20215959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5637.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 20215959 is about 4496.2160757686. The cubic root of 20215959 is about 272.4152709110.

It can be divided in two parts, 202 and 15959, that added together give a palindrome (16161).

The spelling of 20215959 in words is "twenty million, two hundred fifteen thousand, nine hundred fifty-nine".