20866113 has 16 divisors (see below), whose sum is σ = 31749760. Its totient is φ = 13534128.

The previous prime is 20866103. The next prime is 20866121. The reversal of 20866113 is 31166802.

It is not a de Polignac number, because 20866113 - 2⁵ = 20866081 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20866103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9445 + ... + 11442.

It is an arithmetic number, because the mean of its divisors is an integer number (1984360).

Almost surely, 2^20866113 is an apocalyptic number.

It is an amenable number.

20866113 is a deficient number, since it is larger than the sum of its proper divisors (10883647).

20866113 is a wasteful number, since it uses less digits than its factorization.

20866113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20933 (or 20927 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20866113 is about 4567.9440670831. The cubic root of 20866113 is about 275.3048432173.

The spelling of 20866113 in words is "twenty million, eight hundred sixty-six thousand, one hundred thirteen".