20994599 has 4 divisors (see below), whose sum is σ = 21187320. Its totient is φ = 20801880.

The previous prime is 20994569. The next prime is 20994647. The reversal of 20994599 is 99549902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20994599 - 2⁸ = 20994343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20994509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96197 + ... + 96414.

It is an arithmetic number, because the mean of its divisors is an integer number (5296830).

Almost surely, 2^20994599 is an apocalyptic number.

20994599 is a deficient number, since it is larger than the sum of its proper divisors (192721).

20994599 is a wasteful number, since it uses less digits than its factorization.

20994599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192720.

The product of its (nonzero) digits is 262440, while the sum is 47.

The square root of 20994599 is about 4581.9863596480. The cubic root of 20994599 is about 275.8687633094.

The spelling of 20994599 in words is "twenty million, nine hundred ninety-four thousand, five hundred ninety-nine".