20967999 has 12 divisors (see below), whose sum is σ = 30274056. Its totient is φ = 12903072.

The previous prime is 20967983. The next prime is 20968007. The reversal of 20967999 is 99976902.

It is not a de Polignac number, because 20967999 - 2⁴ = 20967983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20967949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20172 + ... + 21185.

It is an arithmetic number, because the mean of its divisors is an integer number (2522838).

Almost surely, 2^20967999 is an apocalyptic number.

20967999 is a deficient number, since it is larger than the sum of its proper divisors (9306057).

20967999 is a wasteful number, since it uses less digits than its factorization.

20967999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41386 (or 41373 counting only the distinct ones).

The product of its (nonzero) digits is 551124, while the sum is 51.

The square root of 20967999 is about 4579.0827684155. The cubic root of 20967999 is about 275.7522061828.

The spelling of 20967999 in words is "twenty million, nine hundred sixty-seven thousand, nine hundred ninety-nine".