20986704 has 60 divisors (see below), whose sum is σ = 62195796. Its totient is φ = 6583296.

The previous prime is 20986703. The next prime is 20986717. The reversal of 20986704 is 40768902.

It can be written as a sum of positive squares in 2 ways, for example, as 11696400 + 9290304 = 3420^2 + 3048^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20986703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1839 + ... + 6734.

Almost surely, 2^20986704 is an apocalyptic number.

20986704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20986704 is an abundant number, since it is smaller than the sum of its proper divisors (41209092).

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

20986704 is a wasteful number, since it uses less digits than its factorization.

20986704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8604 (or 8595 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20986704 is about 4581.1247527218. The cubic root of 20986704 is about 275.8341789074.

The spelling of 20986704 in words is "twenty million, nine hundred eighty-six thousand, seven hundred four".