20045951 has 2 divisors, whose sum is σ = 20045952. Its totient is φ = 20045950.

The previous prime is 20045939. The next prime is 20045953. The reversal of 20045951 is 15954002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20045951 - 2⁶ = 20045887 is a prime.

Together with 20045953, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1273364 and since 20045951 and 1273364 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20045951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20045953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10022975 + 10022976.

It is an arithmetic number, because the mean of its divisors is an integer number (10022976).

Almost surely, 2^20045951 is an apocalyptic number.

20045951 is a deficient number, since it is larger than the sum of its proper divisors (1).

20045951 is an equidigital number, since it uses as much as digits as its factorization.

20045951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 20045951 is about 4477.2704854632. The cubic root of 20045951 is about 271.6494863279.

Adding to 20045951 its reverse (15954002), we get a palindrome (35999953).

The spelling of 20045951 in words is "twenty million, forty-five thousand, nine hundred fifty-one".