20766984 has 48 divisors (see below), whose sum is σ = 60397200. Its totient is φ = 5933088.

The previous prime is 20766973. The next prime is 20767009. The reversal of 20766984 is 48966702.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7654 + ... + 10005.

It is an arithmetic number, because the mean of its divisors is an integer number (1258275).

Almost surely, 2^20766984 is an apocalyptic number.

20766984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20766984 is an abundant number, since it is smaller than the sum of its proper divisors (39630216).

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

20766984 is a wasteful number, since it uses less digits than its factorization.

20766984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17682 (or 17671 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 20766984 is about 4557.0806444477. The cubic root of 20766984 is about 274.8681858642.

It can be divided in two parts, 2076698 and 4, that added together give a palindrome (2076702).

The spelling of 20766984 in words is "twenty million, seven hundred sixty-six thousand, nine hundred eighty-four".