20953879 has 2 divisors, whose sum is σ = 20953880. Its totient is φ = 20953878.

The previous prime is 20953873. The next prime is 20953883. The reversal of 20953879 is 97835902.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20953879 - 2³ = 20953871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20953871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10476939 + 10476940.

It is an arithmetic number, because the mean of its divisors is an integer number (10476940).

Almost surely, 2^20953879 is an apocalyptic number.

20953879 is a deficient number, since it is larger than the sum of its proper divisors (1).

20953879 is an equidigital number, since it uses as much as digits as its factorization.

20953879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 20953879 is about 4577.5407152750. The cubic root of 20953879 is about 275.6902944497.

The spelling of 20953879 in words is "twenty million, nine hundred fifty-three thousand, eight hundred seventy-nine".