20973939 has 8 divisors (see below), whose sum is σ = 31960320. Its totient is φ = 11985096.

The previous prime is 20973913. The next prime is 20973943. The reversal of 20973939 is 93937902.

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

It is not a de Polignac number, because 20973939 - 2¹⁵ = 20941171 is a prime.

It is a super-2 number, since 2×20973939² = 879812234351442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20973939.

It is not an unprimeable number, because it can be changed into a prime (20973959) 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, 499359 + ... + 499400.

It is an arithmetic number, because the mean of its divisors is an integer number (3995040).

Almost surely, 2^20973939 is an apocalyptic number.

20973939 is a deficient number, since it is larger than the sum of its proper divisors (10986381).

20973939 is an equidigital number, since it uses as much as digits as its factorization.

20973939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998769.

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

The square root of 20973939 is about 4579.7313239971. The cubic root of 20973939 is about 275.7782428980.

It can be divided in two parts, 20973 and 939, that added together give a palindrome (21912).

The spelling of 20973939 in words is "twenty million, nine hundred seventy-three thousand, nine hundred thirty-nine".