20369881 has 16 divisors (see below), whose sum is σ = 25574400. Its totient is φ = 15819408.

The previous prime is 20369879. The next prime is 20369891. The reversal of 20369881 is 18896302.

It is a cyclic number.

It is not a de Polignac number, because 20369881 - 2¹ = 20369879 is a prime.

It is a super-2 number, since 2×20369881² = 829864103908322, 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 20369881.

It is not an unprimeable number, because it can be changed into a prime (20369801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271 + ... + 6388.

It is an arithmetic number, because the mean of its divisors is an integer number (1598400).

Almost surely, 2^20369881 is an apocalyptic number.

It is an amenable number.

20369881 is a deficient number, since it is larger than the sum of its proper divisors (5204519).

20369881 is a wasteful number, since it uses less digits than its factorization.

20369881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6708.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 20369881 is about 4513.3004553209. The cubic root of 20369881 is about 273.1049031742.

The spelling of 20369881 in words is "twenty million, three hundred sixty-nine thousand, eight hundred eighty-one".