19713631 has 12 divisors (see below), whose sum is σ = 23148840. Its totient is φ = 16737840.

The previous prime is 19713623. The next prime is 19713643. The reversal of 19713631 is 13631791.

It is not a de Polignac number, because 19713631 - 2³ = 19713623 is a prime.

It is a super-2 number, since 2×19713631² = 777254494408322, 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 = 19713593 and 19713602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19713131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3496 + ... + 7186.

It is an arithmetic number, because the mean of its divisors is an integer number (1929070).

Almost surely, 2^19713631 is an apocalyptic number.

19713631 is a deficient number, since it is larger than the sum of its proper divisors (3435209).

19713631 is a wasteful number, since it uses less digits than its factorization.

19713631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3814 (or 3807 counting only the distinct ones).

The product of its digits is 3402, while the sum is 31.

The square root of 19713631 is about 4440.0034909896. The cubic root of 19713631 is about 270.1399868507.

Subtracting from 19713631 its sum of digits (31), we obtain a square (19713600 = 4440²).

The spelling of 19713631 in words is "nineteen million, seven hundred thirteen thousand, six hundred thirty-one".