20973159 has 12 divisors (see below), whose sum is σ = 30489576. Its totient is φ = 13892112.

The previous prime is 20973133. The next prime is 20973163. The reversal of 20973159 is 95137902.

It is not a de Polignac number, because 20973159 - 2¹³ = 20964967 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20973109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6009 + ... + 8834.

It is an arithmetic number, because the mean of its divisors is an integer number (2540798).

Almost surely, 2^20973159 is an apocalyptic number.

20973159 is a deficient number, since it is larger than the sum of its proper divisors (9516417).

20973159 is a wasteful number, since it uses less digits than its factorization.

20973159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15006 (or 15003 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 20973159 is about 4579.6461653713. The cubic root of 20973159 is about 275.7748242158.

The spelling of 20973159 in words is "twenty million, nine hundred seventy-three thousand, one hundred fifty-nine".