19161420 has 24 divisors (see below), whose sum is σ = 53652144. Its totient is φ = 5109696.

The previous prime is 19161419. The next prime is 19161421. The reversal of 19161420 is 2416191.

It is an interprime number because it is at equal distance from previous prime (19161419) and next prime (19161421).

It is not an unprimeable number, because it can be changed into a prime (19161421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159619 + ... + 159738.

It is an arithmetic number, because the mean of its divisors is an integer number (2235506).

Almost surely, 2^19161420 is an apocalyptic number.

19161420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19161420 is an abundant number, since it is smaller than the sum of its proper divisors (34490724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19161420 is a wasteful number, since it uses less digits than its factorization.

19161420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319369 (or 319367 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 19161420 is about 4377.3759262828. The cubic root of 19161420 is about 267.5937075254.

The spelling of 19161420 in words is "nineteen million, one hundred sixty-one thousand, four hundred twenty".