19972693 has 8 divisors (see below), whose sum is σ = 21606200. Its totient is φ = 18353088.

The previous prime is 19972691. The next prime is 19972703. The reversal of 19972693 is 39627991.

It can be written as a sum of positive squares in 4 ways, for example, as 5280804 + 14691889 = 2298^2 + 3833^2 .

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

It is not a de Polignac number, because 19972693 - 2¹ = 19972691 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19972691) 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, 378 + ... + 6331.

It is an arithmetic number, because the mean of its divisors is an integer number (2700775).

Almost surely, 2^19972693 is an apocalyptic number.

19972693 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

19972693 is a deficient number, since it is larger than the sum of its proper divisors (1633507).

19972693 is a wasteful number, since it uses less digits than its factorization.

19972693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6951.

The product of its digits is 183708, while the sum is 46.

The square root of 19972693 is about 4469.0818967658. The cubic root of 19972693 is about 271.3181677230.

The spelling of 19972693 in words is "nineteen million, nine hundred seventy-two thousand, six hundred ninety-three".