20986782 has 16 divisors (see below), whose sum is σ = 42131712. Its totient is φ = 6969240.

The previous prime is 20986747. The next prime is 20986817. The reversal of 20986782 is 28768902.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20986747) and next prime (20986817).

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, 4828 + ... + 8079.

It is an arithmetic number, because the mean of its divisors is an integer number (2633232).

Almost surely, 2^20986782 is an apocalyptic number.

20986782 is an abundant number, since it is smaller than the sum of its proper divisors (21144930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20986782 is a wasteful number, since it uses less digits than its factorization.

20986782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13183.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 20986782 is about 4581.1332659070. The cubic root of 20986782 is about 275.8345206323.

The spelling of 20986782 in words is "twenty million, nine hundred eighty-six thousand, seven hundred eighty-two".