20886646 has 16 divisors (see below), whose sum is σ = 34257168. Its totient is φ = 9472000.

The previous prime is 20886637. The next prime is 20886661. The reversal of 20886646 is 64668802.

It is a super-2 number, since 2×20886646² = 872503962258632, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20886599 and 20886608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12246 + ... + 13846.

It is an arithmetic number, because the mean of its divisors is an integer number (2141073).

Almost surely, 2^20886646 is an apocalyptic number.

20886646 is a deficient number, since it is larger than the sum of its proper divisors (13370522).

20886646 is a wasteful number, since it uses less digits than its factorization.

20886646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2207.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 20886646 is about 4570.1910244540. The cubic root of 20886646 is about 275.3951168772.

The spelling of 20886646 in words is "twenty million, eight hundred eighty-six thousand, six hundred forty-six".