20869199 has 4 divisors (see below), whose sum is σ = 22474536. Its totient is φ = 19263864.

The previous prime is 20869187. The next prime is 20869223. The reversal of 20869199 is 99196802.

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 20869199 - 2⁸ = 20868943 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 (20869109) 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, 802649 + ... + 802674.

It is an arithmetic number, because the mean of its divisors is an integer number (5618634).

Almost surely, 2^20869199 is an apocalyptic number.

20869199 is a deficient number, since it is larger than the sum of its proper divisors (1605337).

20869199 is a wasteful number, since it uses less digits than its factorization.

20869199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605336.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 20869199 is about 4568.2818433192. The cubic root of 20869199 is about 275.3184146456.

The spelling of 20869199 in words is "twenty million, eight hundred sixty-nine thousand, one hundred ninety-nine".