19975955 has 4 divisors (see below), whose sum is σ = 23971152. Its totient is φ = 15980760.

The previous prime is 19975933. The next prime is 19975981. The reversal of 19975955 is 55957991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55957991 = 79 ⋅708329.

It is not a de Polignac number, because 19975955 - 2⁸ = 19975699 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1997591 + ... + 1997600.

It is an arithmetic number, because the mean of its divisors is an integer number (5992788).

Almost surely, 2^19975955 is an apocalyptic number.

19975955 is a deficient number, since it is larger than the sum of its proper divisors (3995197).

19975955 is an equidigital number, since it uses as much as digits as its factorization.

19975955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3995196.

The product of its digits is 637875, while the sum is 50.

The square root of 19975955 is about 4469.4468337816. The cubic root of 19975955 is about 271.3329377507.

The spelling of 19975955 in words is "nineteen million, nine hundred seventy-five thousand, nine hundred fifty-five".