20862681 has 24 divisors (see below), whose sum is σ = 32531040. Its totient is φ = 11858112.

The previous prime is 20862643. The next prime is 20862683. The reversal of 20862681 is 18626802.

It is not a de Polignac number, because 20862681 - 2⁶ = 20862617 is a prime.

It is a super-2 number, since 2×20862681² = 870502917015522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20862683) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50805 + ... + 51213.

It is an arithmetic number, because the mean of its divisors is an integer number (1355460).

Almost surely, 2^20862681 is an apocalyptic number.

20862681 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20862681 is a deficient number, since it is larger than the sum of its proper divisors (11668359).

20862681 is a wasteful number, since it uses less digits than its factorization.

20862681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773 (or 766 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 20862681 is about 4567.5683902926. The cubic root of 20862681 is about 275.2897485991.

The spelling of 20862681 in words is "twenty million, eight hundred sixty-two thousand, six hundred eighty-one".