19973431 has 8 divisors (see below), whose sum is σ = 20772000. Its totient is φ = 19182240.

The previous prime is 19973423. The next prime is 19973461. The reversal of 19973431 is 13437991.

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

It is a cyclic number.

It is not a de Polignac number, because 19973431 - 2³ = 19973423 is a prime.

It is a super-2 number, since 2×19973431² = 797875891823522, which contains 22 as substring.

It is a Duffinian number.

19973431 is a modest number, since divided by 73431 gives 199 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19973461) 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, 4041 + ... + 7501.

It is an arithmetic number, because the mean of its divisors is an integer number (2596500).

Almost surely, 2^19973431 is an apocalyptic number.

19973431 is a deficient number, since it is larger than the sum of its proper divisors (798569).

19973431 is a wasteful number, since it uses less digits than its factorization.

19973431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3689.

The product of its digits is 20412, while the sum is 37.

The square root of 19973431 is about 4469.1644632974. The cubic root of 19973431 is about 271.3215094580.

The spelling of 19973431 in words is "nineteen million, nine hundred seventy-three thousand, four hundred thirty-one".