19979741 has 4 divisors (see below), whose sum is σ = 20519772. Its totient is φ = 19439712.

The previous prime is 19979737. The next prime is 19979759. The reversal of 19979741 is 14797991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18887716 + 1092025 = 4346^2 + 1045^2 .

It is a cyclic number.

It is not a de Polignac number, because 19979741 - 2² = 19979737 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 (19979711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269960 + ... + 270033.

It is an arithmetic number, because the mean of its divisors is an integer number (5129943).

Almost surely, 2^19979741 is an apocalyptic number.

It is an amenable number.

19979741 is a deficient number, since it is larger than the sum of its proper divisors (540031).

19979741 is an equidigital number, since it uses as much as digits as its factorization.

19979741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540030.

The product of its digits is 142884, while the sum is 47.

The square root of 19979741 is about 4469.8703560618. The cubic root of 19979741 is about 271.3500783848.

The spelling of 19979741 in words is "nineteen million, nine hundred seventy-nine thousand, seven hundred forty-one".