20365816 has 8 divisors (see below), whose sum is σ = 38185920. Its totient is φ = 10182904.

The previous prime is 20365811. The next prime is 20365819. The reversal of 20365816 is 61856302.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×20365816² = 829532922691712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20365811) 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 as a sum of consecutive naturals, namely, 1272856 + ... + 1272871.

It is an arithmetic number, because the mean of its divisors is an integer number (4773240).

Almost surely, 2^20365816 is an apocalyptic number.

It is an amenable number.

20365816 is a deficient number, since it is larger than the sum of its proper divisors (17820104).

20365816 is a wasteful number, since it uses less digits than its factorization.

20365816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545733 (or 2545729 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20365816 is about 4512.8500972224. The cubic root of 20365816 is about 273.0867350876.

The spelling of 20365816 in words is "twenty million, three hundred sixty-five thousand, eight hundred sixteen".