20792993 has 4 divisors (see below), whose sum is σ = 22392468. Its totient is φ = 19193520.

The previous prime is 20792987. The next prime is 20793007. The reversal of 20792993 is 39929702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9690769 + 11102224 = 3113^2 + 3332^2 .

It is a cyclic number.

It is not a de Polignac number, because 20792993 - 2¹⁶ = 20727457 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 20792993.

It is not an unprimeable number, because it can be changed into a prime (20792963) 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, 799718 + ... + 799743.

It is an arithmetic number, because the mean of its divisors is an integer number (5598117).

Almost surely, 2^20792993 is an apocalyptic number.

It is an amenable number.

20792993 is a deficient number, since it is larger than the sum of its proper divisors (1599475).

20792993 is a wasteful number, since it uses less digits than its factorization.

20792993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1599474.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 20792993 is about 4559.9334424967. The cubic root of 20792993 is about 274.9828881914.

The spelling of 20792993 in words is "twenty million, seven hundred ninety-two thousand, nine hundred ninety-three".