20357381 has 8 divisors (see below), whose sum is σ = 23514624. Its totient is φ = 17417920.

The previous prime is 20357377. The next prime is 20357383. The reversal of 20357381 is 18375302.

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

It is a cyclic number.

It is not a de Polignac number, because 20357381 - 2² = 20357377 is a prime.

It is a super-2 number, since 2×20357381² = 828845922358322, 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 (20357383) 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, 54245 + ... + 54618.

It is an arithmetic number, because the mean of its divisors is an integer number (2939328).

Almost surely, 2^20357381 is an apocalyptic number.

It is an amenable number.

20357381 is a deficient number, since it is larger than the sum of its proper divisors (3157243).

20357381 is a wasteful number, since it uses less digits than its factorization.

20357381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108891.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20357381 is about 4511.9154469028. The cubic root of 20357381 is about 273.0490280348.

The spelling of 20357381 in words is "twenty million, three hundred fifty-seven thousand, three hundred eighty-one".