20860381 has 4 divisors (see below), whose sum is σ = 20884000. Its totient is φ = 20836764.

The previous prime is 20860373. The next prime is 20860387. The reversal of 20860381 is 18306802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20860381 - 2³ = 20860373 is a prime.

It is a super-2 number, since 2×20860381² = 870310990930322, 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 (20860387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10431 + ... + 12268.

It is an arithmetic number, because the mean of its divisors is an integer number (5221000).

Almost surely, 2^20860381 is an apocalyptic number.

It is an amenable number.

20860381 is a deficient number, since it is larger than the sum of its proper divisors (23619).

20860381 is an equidigital number, since it uses as much as digits as its factorization.

20860381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23618.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20860381 is about 4567.3166082504. The cubic root of 20860381 is about 275.2796318154.

The spelling of 20860381 in words is "twenty million, eight hundred sixty thousand, three hundred eighty-one".