20986844820 has 48 divisors (see below), whose sum is σ = 61855967040. Its totient is φ = 5301939456.

The previous prime is 20986844803. The next prime is 20986844821. The reversal of 20986844820 is 2844868902.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20986844821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9203617 + ... + 9205896.

It is an arithmetic number, because the mean of its divisors is an integer number (1288665980).

Almost surely, 2^20986844820 is an apocalyptic number.

20986844820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20986844820 is an abundant number, since it is smaller than the sum of its proper divisors (40869122220).

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

20986844820 is a wasteful number, since it uses less digits than its factorization.

20986844820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18409544 (or 18409542 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 51.

The spelling of 20986844820 in words is "twenty billion, nine hundred eighty-six million, eight hundred forty-four thousand, eight hundred twenty".