20266999 has 2 divisors, whose sum is σ = 20267000. Its totient is φ = 20266998.

The previous prime is 20266957. The next prime is 20267029. The reversal of 20266999 is 99966202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20266999 - 2⁷ = 20266871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20266949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10133499 + 10133500.

It is an arithmetic number, because the mean of its divisors is an integer number (10133500).

Almost surely, 2^20266999 is an apocalyptic number.

20266999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20266999 is an equidigital number, since it uses as much as digits as its factorization.

20266999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 20266999 is about 4501.8883815572. Note that the first 3 decimals coincide. The cubic root of 20266999 is about 272.6443373041.

It can be divided in two parts, 2026 and 6999, that added together give a square (9025 = 95²).

The spelling of 20266999 in words is "twenty million, two hundred sixty-six thousand, nine hundred ninety-nine".