20372691 has 4 divisors (see below), whose sum is σ = 27163592. Its totient is φ = 13581792.

The previous prime is 20372659. The next prime is 20372701. The reversal of 20372691 is 19627302.

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

It is not a de Polignac number, because 20372691 - 2⁵ = 20372659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20372491) 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, 3395446 + ... + 3395451.

It is an arithmetic number, because the mean of its divisors is an integer number (6790898).

Almost surely, 2^20372691 is an apocalyptic number.

20372691 is a deficient number, since it is larger than the sum of its proper divisors (6790901).

20372691 is an equidigital number, since it uses as much as digits as its factorization.

20372691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6790900.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 20372691 is about 4513.6117467057. The cubic root of 20372691 is about 273.1174607585.

Adding to 20372691 its reverse (19627302), we get a palindrome (39999993).

The spelling of 20372691 in words is "twenty million, three hundred seventy-two thousand, six hundred ninety-one".