20137881 has 8 divisors (see below), whose sum is σ = 26872384. Its totient is φ = 13414320.

The previous prime is 20137849. The next prime is 20137883. The reversal of 20137881 is 18873102.

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 20137881 - 2⁵ = 20137849 is a prime.

It is a super-2 number, since 2×20137881² = 811068502340322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (20137883) 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 7 ways as a sum of consecutive naturals, for example, 3780 + ... + 7386.

It is an arithmetic number, because the mean of its divisors is an integer number (3359048).

Almost surely, 2^20137881 is an apocalyptic number.

It is an amenable number.

20137881 is a deficient number, since it is larger than the sum of its proper divisors (6734503).

20137881 is a wasteful number, since it uses less digits than its factorization.

20137881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5471.

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

The square root of 20137881 is about 4487.5250417129. The cubic root of 20137881 is about 272.0641113653.

The spelling of 20137881 in words is "twenty million, one hundred thirty-seven thousand, eight hundred eighty-one".