20972073 has 4 divisors (see below), whose sum is σ = 27962768. Its totient is φ = 13981380.

The previous prime is 20972071. The next prime is 20972087. The reversal of 20972073 is 37027902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20972073 - 2¹ = 20972071 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20972073.

It is not an unprimeable number, because it can be changed into a prime (20972071) 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, 3495343 + ... + 3495348.

It is an arithmetic number, because the mean of its divisors is an integer number (6990692).

Almost surely, 2^20972073 is an apocalyptic number.

It is an amenable number.

20972073 is a deficient number, since it is larger than the sum of its proper divisors (6990695).

20972073 is an equidigital number, since it uses as much as digits as its factorization.

20972073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6990694.

The product of its (nonzero) digits is 5292, while the sum is 30.

The square root of 20972073 is about 4579.5275957243. The cubic root of 20972073 is about 275.7700642171.

Adding to 20972073 its reverse (37027902), we get a palindrome (57999975).

The spelling of 20972073 in words is "twenty million, nine hundred seventy-two thousand, seventy-three".