20937381 has 8 divisors (see below), whose sum is σ = 27946464. Its totient is φ = 13943280.

The previous prime is 20937361. The next prime is 20937409. The reversal of 20937381 is 18373902.

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

It is not a de Polignac number, because 20937381 - 2⁷ = 20937253 is a prime.

It is a super-2 number, since 2×20937381² = 876747846278322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20937311) 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, 75 + ... + 6471.

It is an arithmetic number, because the mean of its divisors is an integer number (3493308).

Almost surely, 2^20937381 is an apocalyptic number.

It is an amenable number.

20937381 is a deficient number, since it is larger than the sum of its proper divisors (7009083).

20937381 is a wasteful number, since it uses less digits than its factorization.

20937381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7491.

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

The square root of 20937381 is about 4575.7383010832. The cubic root of 20937381 is about 275.6179206948.

The spelling of 20937381 in words is "twenty million, nine hundred thirty-seven thousand, three hundred eighty-one".