20358881 has 4 divisors (see below), whose sum is σ = 20465664. Its totient is φ = 20252100.

The previous prime is 20358869. The next prime is 20358883. The reversal of 20358881 is 18885302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20358881 is a prime.

It is a super-2 number, since 2×20358881² = 828968071144322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20358883) 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 3 ways as a sum of consecutive naturals, for example, 53105 + ... + 53486.

It is an arithmetic number, because the mean of its divisors is an integer number (5116416).

Almost surely, 2^20358881 is an apocalyptic number.

It is an amenable number.

20358881 is a deficient number, since it is larger than the sum of its proper divisors (106783).

20358881 is a wasteful number, since it uses less digits than its factorization.

20358881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106782.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 20358881 is about 4512.0816703601. The cubic root of 20358881 is about 273.0557342590.

The spelling of 20358881 in words is "twenty million, three hundred fifty-eight thousand, eight hundred eighty-one".