19925813 has 16 divisors (see below), whose sum is σ = 22228800. Its totient is φ = 17802288.

The previous prime is 19925783. The next prime is 19925831. The reversal of 19925813 is 31852991.

It is not a de Polignac number, because 19925813 - 2⁶ = 19925749 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 (19925413) 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, 463370 + ... + 463412.

It is an arithmetic number, because the mean of its divisors is an integer number (1389300).

Almost surely, 2^19925813 is an apocalyptic number.

It is an amenable number.

19925813 is a deficient number, since it is larger than the sum of its proper divisors (2302987).

19925813 is an frugal number, since it uses more digits than its factorization.

19925813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 91 counting only the distinct ones).

The product of its digits is 19440, while the sum is 38.

The square root of 19925813 is about 4463.8338902786. The cubic root of 19925813 is about 271.1057216535.

The spelling of 19925813 in words is "nineteen million, nine hundred twenty-five thousand, eight hundred thirteen".