20866662 has 12 divisors (see below), whose sum is σ = 45211140. Its totient is φ = 6955548.

The previous prime is 20866661. The next prime is 20866669. The reversal of 20866662 is 26666802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20866661) 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, 579612 + ... + 579647.

It is an arithmetic number, because the mean of its divisors is an integer number (3767595).

Almost surely, 2^20866662 is an apocalyptic number.

20866662 is an abundant number, since it is smaller than the sum of its proper divisors (24344478).

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

20866662 is a wasteful number, since it uses less digits than its factorization.

20866662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159267 (or 1159264 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 20866662 is about 4568.0041593676. The cubic root of 20866662 is about 275.3072576749.

It can be divided in two parts, 20866 and 662, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 20866662 in words is "twenty million, eight hundred sixty-six thousand, six hundred sixty-two".