20792551 has 4 divisors (see below), whose sum is σ = 22391992. Its totient is φ = 19193112.

The previous prime is 20792543. The next prime is 20792633. The reversal of 20792551 is 15529702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15529702 = 2 ⋅7764851.

It is a cyclic number.

It is not a de Polignac number, because 20792551 - 2³ = 20792543 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 (20792501) 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, 799701 + ... + 799726.

It is an arithmetic number, because the mean of its divisors is an integer number (5597998).

Almost surely, 2^20792551 is an apocalyptic number.

20792551 is a deficient number, since it is larger than the sum of its proper divisors (1599441).

20792551 is a wasteful number, since it uses less digits than its factorization.

20792551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1599440.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 20792551 is about 4559.8849766195. The cubic root of 20792551 is about 274.9809397258.

The spelling of 20792551 in words is "twenty million, seven hundred ninety-two thousand, five hundred fifty-one".