20395631 has 8 divisors (see below), whose sum is σ = 22098384. Its totient is φ = 18748800.

The previous prime is 20395579. The next prime is 20395633. The reversal of 20395631 is 13659302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20395631 is a prime.

It is a super-2 number, since 2×20395631² = 831963527776322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20395594 and 20395603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20395633) 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, 13220 + ... + 14681.

It is an arithmetic number, because the mean of its divisors is an integer number (2762298).

Almost surely, 2^20395631 is an apocalyptic number.

20395631 is a deficient number, since it is larger than the sum of its proper divisors (1702753).

20395631 is a wasteful number, since it uses less digits than its factorization.

20395631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27961.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 20395631 is about 4516.1522339266. The cubic root of 20395631 is about 273.2199339566.

The spelling of 20395631 in words is "twenty million, three hundred ninety-five thousand, six hundred thirty-one".