20440686 has 16 divisors (see below), whose sum is σ = 46721664. Its totient is φ = 5840184.

The previous prime is 20440649. The next prime is 20440691. The reversal of 20440686 is 68604402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243300 + ... + 243383.

It is an arithmetic number, because the mean of its divisors is an integer number (2920104).

Almost surely, 2^20440686 is an apocalyptic number.

20440686 is an abundant number, since it is smaller than the sum of its proper divisors (26280978).

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

20440686 is a wasteful number, since it uses less digits than its factorization.

20440686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486695.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 20440686 is about 4521.1376886797. The cubic root of 20440686 is about 273.4209716333.

The spelling of 20440686 in words is "twenty million, four hundred forty thousand, six hundred eighty-six".