20986600 has 24 divisors (see below), whose sum is σ = 48794310. Its totient is φ = 8394560.

The previous prime is 20986577. The next prime is 20986601. The reversal of 20986600 is 668902.

It can be written as a sum of positive squares in 3 ways, for example, as 15350724 + 5635876 = 3918^2 + 2374^2 .

It is not an unprimeable number, because it can be changed into a prime (20986601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52267 + ... + 52666.

Almost surely, 2^20986600 is an apocalyptic number.

20986600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20986600 is an abundant number, since it is smaller than the sum of its proper divisors (27807710).

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

20986600 is a wasteful number, since it uses less digits than its factorization.

20986600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104949 (or 104940 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20986600 is about 4581.1134017835. The cubic root of 20986600 is about 275.8337232728.

The spelling of 20986600 in words is "twenty million, nine hundred eighty-six thousand, six hundred".