19720131 has 16 divisors (see below), whose sum is σ = 27605760. Its totient is φ = 12497760.

The previous prime is 19720117. The next prime is 19720133. The reversal of 19720131 is 13102791.

It is not a de Polignac number, because 19720131 - 2⁶ = 19720067 is a prime.

It is a super-2 number, since 2×19720131² = 777767133314322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19720133) 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, 11700 + ... + 13278.

It is an arithmetic number, because the mean of its divisors is an integer number (1725360).

Almost surely, 2^19720131 is an apocalyptic number.

19720131 is a deficient number, since it is larger than the sum of its proper divisors (7885629).

19720131 is a wasteful number, since it uses less digits than its factorization.

19720131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1786.

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 19720131 is about 4440.7354120686. The cubic root of 19720131 is about 270.1696738722.

The spelling of 19720131 in words is "nineteen million, seven hundred twenty thousand, one hundred thirty-one".