20994249 has 16 divisors (see below), whose sum is σ = 28641600. Its totient is φ = 13675200.

The previous prime is 20994247. The next prime is 20994271. The reversal of 20994249 is 94249902.

It is not a de Polignac number, because 20994249 - 2¹ = 20994247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20994241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29599 + ... + 30299.

It is an arithmetic number, because the mean of its divisors is an integer number (1790100).

Almost surely, 2^20994249 is an apocalyptic number.

It is an amenable number.

20994249 is a deficient number, since it is larger than the sum of its proper divisors (7647351).

20994249 is a wasteful number, since it uses less digits than its factorization.

20994249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 20994249 is about 4581.9481664462. The cubic root of 20994249 is about 275.8672303023.

The spelling of 20994249 in words is "twenty million, nine hundred ninety-four thousand, two hundred forty-nine".