20986210 has 24 divisors (see below), whose sum is σ = 43943580. Its totient is φ = 7195104.

The previous prime is 20986181. The next prime is 20986237. The reversal of 20986210 is 1268902.

20986210 = 162² + 163² + ... + 406².

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20766249 + 219961 = 4557^2 + 469^2 .

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, 20925 + ... + 21904.

Almost surely, 2^20986210 is an apocalyptic number.

20986210 is an abundant number, since it is smaller than the sum of its proper divisors (22957370).

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

20986210 is a wasteful number, since it uses less digits than its factorization.

20986210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42850 (or 42843 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 20986210 is about 4581.0708355143. The cubic root of 20986210 is about 275.8320146299.

The spelling of 20986210 in words is "twenty million, nine hundred eighty-six thousand, two hundred ten".