20361381 has 16 divisors (see below), whose sum is σ = 28028160. Its totient is φ = 13141440.

The previous prime is 20361377. The next prime is 20361401. The reversal of 20361381 is 18316302.

It is not a de Polignac number, because 20361381 - 2² = 20361377 is a prime.

It is a super-2 number, since 2×20361381² = 829171672454322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20361301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11751 + ... + 13371.

It is an arithmetic number, because the mean of its divisors is an integer number (1751760).

Almost surely, 2^20361381 is an apocalyptic number.

It is an amenable number.

20361381 is a deficient number, since it is larger than the sum of its proper divisors (7666779).

20361381 is a wasteful number, since it uses less digits than its factorization.

20361381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20361381 is about 4512.3586958485. The cubic root of 20361381 is about 273.0669105673.

Adding to 20361381 its reverse (18316302), we get a palindrome (38677683).

The spelling of 20361381 in words is "twenty million, three hundred sixty-one thousand, three hundred eighty-one".