19995957 has 8 divisors (see below), whose sum is σ = 29623680. Its totient is φ = 13330620.

The previous prime is 19995953. The next prime is 19995959. The reversal of 19995957 is 75959991.

It is not a de Polignac number, because 19995957 - 2² = 19995953 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19995953) 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, 370269 + ... + 370322.

It is an arithmetic number, because the mean of its divisors is an integer number (3702960).

Almost surely, 2^19995957 is an apocalyptic number.

It is an amenable number.

19995957 is a deficient number, since it is larger than the sum of its proper divisors (9627723).

19995957 is an equidigital number, since it uses as much as digits as its factorization.

19995957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740600 (or 740594 counting only the distinct ones).

The product of its digits is 1148175, while the sum is 54.

The square root of 19995957 is about 4471.6839110116. The cubic root of 19995957 is about 271.4234697762.

The spelling of 19995957 in words is "nineteen million, nine hundred ninety-five thousand, nine hundred fifty-seven".