20996859 has 16 divisors (see below), whose sum is σ = 30447872. Its totient is φ = 12793248.

The previous prime is 20996849. The next prime is 20996863. The reversal of 20996859 is 95869902.

It is not a de Polignac number, because 20996859 - 2²¹ = 18899707 is a prime.

It is a super-3 number, since 3×20996859³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20996849) 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, 1404 + ... + 6630.

It is an arithmetic number, because the mean of its divisors is an integer number (1902992).

Almost surely, 2^20996859 is an apocalyptic number.

20996859 is a deficient number, since it is larger than the sum of its proper divisors (9451013).

20996859 is a wasteful number, since it uses less digits than its factorization.

20996859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5346.

The product of its (nonzero) digits is 349920, while the sum is 48.

The square root of 20996859 is about 4582.2329709433. The cubic root of 20996859 is about 275.8786617446.

The spelling of 20996859 in words is "twenty million, nine hundred ninety-six thousand, eight hundred fifty-nine".