20366731 has 16 divisors (see below), whose sum is σ = 26887680. Its totient is φ = 14935680.

The previous prime is 20366719. The next prime is 20366737. The reversal of 20366731 is 13766302.

It is a cyclic number.

It is not a de Polignac number, because 20366731 - 2⁵ = 20366699 is a prime.

It is a super-2 number, since 2×20366731² = 829607463252722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20366731.

It is not an unprimeable number, because it can be changed into a prime (20366737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6471 + ... + 9088.

It is an arithmetic number, because the mean of its divisors is an integer number (1680480).

Almost surely, 2^20366731 is an apocalyptic number.

20366731 is a deficient number, since it is larger than the sum of its proper divisors (6520949).

20366731 is a wasteful number, since it uses less digits than its factorization.

20366731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15594.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 20366731 is about 4512.9514732600. The cubic root of 20366731 is about 273.0908247939.

The spelling of 20366731 in words is "twenty million, three hundred sixty-six thousand, seven hundred thirty-one".