20372791 has 4 divisors (see below), whose sum is σ = 20502712. Its totient is φ = 20242872.

The previous prime is 20372789. The next prime is 20372801. The reversal of 20372791 is 19727302.

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

It is a cyclic number.

It is not a de Polignac number, because 20372791 - 2¹ = 20372789 is a prime.

It is a super-2 number, since 2×20372791² = 830101226259362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20372701) 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, 64725 + ... + 65038.

It is an arithmetic number, because the mean of its divisors is an integer number (5125678).

Almost surely, 2^20372791 is an apocalyptic number.

20372791 is a deficient number, since it is larger than the sum of its proper divisors (129921).

20372791 is a wasteful number, since it uses less digits than its factorization.

20372791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129920.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 20372791 is about 4513.6228242954. The cubic root of 20372791 is about 273.1179076263.

The spelling of 20372791 in words is "twenty million, three hundred seventy-two thousand, seven hundred ninety-one".