20790997 has 4 divisors (see below), whose sum is σ = 21885280. Its totient is φ = 19696716.

The previous prime is 20790947. The next prime is 20791007. The reversal of 20790997 is 79909702.

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 a cyclic number.

It is not a de Polignac number, because 20790997 - 2¹⁹ = 20266709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20790937) 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, 547113 + ... + 547150.

It is an arithmetic number, because the mean of its divisors is an integer number (5471320).

Almost surely, 2^20790997 is an apocalyptic number.

It is an amenable number.

20790997 is a deficient number, since it is larger than the sum of its proper divisors (1094283).

20790997 is a wasteful number, since it uses less digits than its factorization.

20790997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094282.

The product of its (nonzero) digits is 71442, while the sum is 43.

The square root of 20790997 is about 4559.7145744005. The cubic root of 20790997 is about 274.9740890188.

It can be divided in two parts, 207 and 90997, that added together give a square (91204 = 302²).

The spelling of 20790997 in words is "twenty million, seven hundred ninety thousand, nine hundred ninety-seven".