20873381 has 12 divisors (see below), whose sum is σ = 22384512. Its totient is φ = 19457064.

The previous prime is 20873371. The next prime is 20873389. The reversal of 20873381 is 18337802.

It is not a de Polignac number, because 20873381 - 2⁶ = 20873317 is a prime.

It is a super-2 number, since 2×20873381² = 871396068742322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20873389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23756 + ... + 24618.

It is an arithmetic number, because the mean of its divisors is an integer number (1865376).

Almost surely, 2^20873381 is an apocalyptic number.

It is an amenable number.

20873381 is a deficient number, since it is larger than the sum of its proper divisors (1511131).

20873381 is an equidigital number, since it uses as much as digits as its factorization.

20873381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968 (or 949 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20873381 is about 4568.7395417117. The cubic root of 20873381 is about 275.3368038629.

The spelling of 20873381 in words is "twenty million, eight hundred seventy-three thousand, three hundred eighty-one".