20791051 has 4 divisors (see below), whose sum is σ = 22014072. Its totient is φ = 19568032.

The previous prime is 20791037. The next prime is 20791081. The reversal of 20791051 is 15019702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15019702 = 2 ⋅7509851.

It is a cyclic number.

It is not a de Polignac number, because 20791051 - 2⁵ = 20791019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20791021) 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, 611485 + ... + 611518.

It is an arithmetic number, because the mean of its divisors is an integer number (5503518).

Almost surely, 2^20791051 is an apocalyptic number.

20791051 is a deficient number, since it is larger than the sum of its proper divisors (1223021).

20791051 is a wasteful number, since it uses less digits than its factorization.

20791051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223020.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 20791051 is about 4559.7204958199. The cubic root of 20791051 is about 274.9743270799.

The spelling of 20791051 in words is "twenty million, seven hundred ninety-one thousand, fifty-one".