20195631 has 6 divisors (see below), whose sum is σ = 29171480. Its totient is φ = 13463748.

The previous prime is 20195621. The next prime is 20195647. The reversal of 20195631 is 13659102.

20195631 is a `hidden beast` number, since 20 + 1 + 9 + 5 + 631 = 666.

It is not a de Polignac number, because 20195631 - 2⁷ = 20195503 is a prime.

It is a super-2 number, since 2×20195631² = 815727022976322, 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 = 20195595 and 20195604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20195621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1121971 + ... + 1121988.

Almost surely, 2^20195631 is an apocalyptic number.

20195631 is a deficient number, since it is larger than the sum of its proper divisors (8975849).

20195631 is a wasteful number, since it uses less digits than its factorization.

20195631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2243965 (or 2243962 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 20195631 is about 4493.9549396940. The cubic root of 20195631 is about 272.3239319383.

The spelling of 20195631 in words is "twenty million, one hundred ninety-five thousand, six hundred thirty-one".