20960999 has 2 divisors, whose sum is σ = 20961000. Its totient is φ = 20960998.

The previous prime is 20960959. The next prime is 20961011. The reversal of 20960999 is 99906902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20960999 - 2²⁴ = 4183783 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20960959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10480499 + 10480500.

It is an arithmetic number, because the mean of its divisors is an integer number (10480500).

Almost surely, 2^20960999 is an apocalyptic number.

20960999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20960999 is an equidigital number, since it uses as much as digits as its factorization.

20960999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 20960999 is about 4578.3183593979. The cubic root of 20960999 is about 275.7215168725.

The spelling of 20960999 in words is "twenty million, nine hundred sixty thousand, nine hundred ninety-nine".