20326951 has 4 divisors (see below), whose sum is σ = 21522672. Its totient is φ = 19131232.

The previous prime is 20326921. The next prime is 20326961. The reversal of 20326951 is 15962302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15962302 = 2 ⋅7981151.

It is a cyclic number.

It is not a de Polignac number, because 20326951 - 2⁵ = 20326919 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 (20326921) 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, 597835 + ... + 597868.

It is an arithmetic number, because the mean of its divisors is an integer number (5380668).

Almost surely, 2^20326951 is an apocalyptic number.

20326951 is a deficient number, since it is larger than the sum of its proper divisors (1195721).

20326951 is a wasteful number, since it uses less digits than its factorization.

20326951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195720.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 20326951 is about 4508.5420037968. The cubic root of 20326951 is about 272.9129099134.

The spelling of 20326951 in words is "twenty million, three hundred twenty-six thousand, nine hundred fifty-one".