20988793 has 4 divisors (see below), whose sum is σ = 23987200. Its totient is φ = 17990388.

The previous prime is 20988769. The next prime is 20988797. The reversal of 20988793 is 39788902.

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 20988793 - 2¹⁷ = 20857721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20988797) 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, 1499193 + ... + 1499206.

It is an arithmetic number, because the mean of its divisors is an integer number (5996800).

Almost surely, 2^20988793 is an apocalyptic number.

It is an amenable number.

20988793 is a deficient number, since it is larger than the sum of its proper divisors (2998407).

20988793 is an equidigital number, since it uses as much as digits as its factorization.

20988793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2998406.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 20988793 is about 4581.3527478246. The cubic root of 20988793 is about 275.8433307094.

The spelling of 20988793 in words is "twenty million, nine hundred eighty-eight thousand, seven hundred ninety-three".