19954742 has 4 divisors (see below), whose sum is σ = 29932116. Its totient is φ = 9977370.

The previous prime is 19954733. The next prime is 19954757. The reversal of 19954742 is 24745991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24745991 = 439 ⋅56369.

It is a self number, because there is not a number n which added to its sum of digits gives 19954742.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4988684 + ... + 4988687.

It is an arithmetic number, because the mean of its divisors is an integer number (7483029).

Almost surely, 2^19954742 is an apocalyptic number.

19954742 is a deficient number, since it is larger than the sum of its proper divisors (9977374).

19954742 is an equidigital number, since it uses as much as digits as its factorization.

19954742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9977373.

The product of its digits is 90720, while the sum is 41.

The square root of 19954742 is about 4467.0730909624. The cubic root of 19954742 is about 271.2368585024.

The spelling of 19954742 in words is "nineteen million, nine hundred fifty-four thousand, seven hundred forty-two".