20966899 has 16 divisors (see below), whose sum is σ = 23587200. Its totient is φ = 18520704.

The previous prime is 20966851. The next prime is 20966903. The reversal of 20966899 is 99866902.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20966899 - 2¹¹ = 20964851 is a prime.

It is a super-2 number, since 2×20966899² = 879221707352402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20966809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44664 + ... + 45130.

It is an arithmetic number, because the mean of its divisors is an integer number (1474200).

Almost surely, 2^20966899 is an apocalyptic number.

20966899 is a deficient number, since it is larger than the sum of its proper divisors (2620301).

20966899 is a wasteful number, since it uses less digits than its factorization.

20966899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 20966899 is about 4578.9626554494. The cubic root of 20966899 is about 275.7473840293.

The spelling of 20966899 in words is "twenty million, nine hundred sixty-six thousand, eight hundred ninety-nine".