20373981 has 8 divisors (see below), whose sum is σ = 27187104. Its totient is φ = 13571760.

The previous prime is 20373971. The next prime is 20374027. The reversal of 20373981 is 18937302.

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

It is not a de Polignac number, because 20373981 - 2⁶ = 20373917 is a prime.

It is a super-2 number, since 2×20373981² = 830198203576722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20373911) 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, 4035 + ... + 7551.

It is an arithmetic number, because the mean of its divisors is an integer number (3398388).

Almost surely, 2^20373981 is an apocalyptic number.

It is an amenable number.

20373981 is a deficient number, since it is larger than the sum of its proper divisors (6813123).

20373981 is a wasteful number, since it uses less digits than its factorization.

20373981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5451.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 20373981 is about 4513.7546455252. The cubic root of 20373981 is about 273.1232252414.

The spelling of 20373981 in words is "twenty million, three hundred seventy-three thousand, nine hundred eighty-one".