20862979 has 2 divisors, whose sum is σ = 20862980. Its totient is φ = 20862978.

The previous prime is 20862949. The next prime is 20862983. The reversal of 20862979 is 97926802.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20862979 - 2⁹ = 20862467 is a prime.

It is not a weakly prime, because it can be changed into another prime (20862949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10431489 + 10431490.

It is an arithmetic number, because the mean of its divisors is an integer number (10431490).

Almost surely, 2^20862979 is an apocalyptic number.

20862979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20862979 is an equidigital number, since it uses as much as digits as its factorization.

20862979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 20862979 is about 4567.6010114720. The cubic root of 20862979 is about 275.2910593279.

The spelling of 20862979 in words is "twenty million, eight hundred sixty-two thousand, nine hundred seventy-nine".