20993937 has 8 divisors (see below), whose sum is σ = 28329504. Its totient is φ = 13827168.

The previous prime is 20993923. The next prime is 20993939. The reversal of 20993937 is 73939902.

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

It is not a de Polignac number, because 20993937 - 2⁶ = 20993873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20993939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41908 + ... + 42405.

It is an arithmetic number, because the mean of its divisors is an integer number (3541188).

Almost surely, 2^20993937 is an apocalyptic number.

It is an amenable number.

20993937 is a deficient number, since it is larger than the sum of its proper divisors (7335567).

20993937 is an equidigital number, since it uses as much as digits as its factorization.

20993937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84399.

The product of its (nonzero) digits is 91854, while the sum is 42.

The square root of 20993937 is about 4581.9141196666. The cubic root of 20993937 is about 275.8658637217.

The spelling of 20993937 in words is "twenty million, nine hundred ninety-three thousand, nine hundred thirty-seven".