20371881 has 8 divisors (see below), whose sum is σ = 27230560. Its totient is φ = 13547232.

The previous prime is 20371873. The next prime is 20371927. The reversal of 20371881 is 18817302.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20371881 - 2³ = 20371873 is a prime.

It is a super-2 number, since 2×20371881² = 830027070956322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20371861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7075 + ... + 9528.

It is an arithmetic number, because the mean of its divisors is an integer number (3403820).

Almost surely, 2^20371881 is an apocalyptic number.

It is an amenable number.

20371881 is a deficient number, since it is larger than the sum of its proper divisors (6858679).

20371881 is a wasteful number, since it uses less digits than its factorization.

20371881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17015.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 20371881 is about 4513.5220172278. The cubic root of 20371881 is about 273.1138410751.

The spelling of 20371881 in words is "twenty million, three hundred seventy-one thousand, eight hundred eighty-one".