19901427 has 32 divisors (see below), whose sum is σ = 32901120. Its totient is φ = 10419840.

The previous prime is 19901423. The next prime is 19901459. The reversal of 19901427 is 72410991.

It is not a de Polignac number, because 19901427 - 2² = 19901423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19901423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73302 + ... + 73572.

It is an arithmetic number, because the mean of its divisors is an integer number (1028160).

Almost surely, 2^19901427 is an apocalyptic number.

19901427 is a deficient number, since it is larger than the sum of its proper divisors (12999693).

19901427 is a wasteful number, since it uses less digits than its factorization.

19901427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 19901427 is about 4461.1015455827. The cubic root of 19901427 is about 270.9950798615.

The spelling of 19901427 in words is "nineteen million, nine hundred one thousand, four hundred twenty-seven".