19091020 has 48 divisors (see below), whose sum is σ = 43662528. Its totient is φ = 6969600.

The previous prime is 19090999. The next prime is 19091057. The reversal of 19091020 is 2019091.

It is a junction number, because it is equal to n+sod(n) for n = 19090982 and 19091000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25897 + ... + 26623.

It is an arithmetic number, because the mean of its divisors is an integer number (909636).

Almost surely, 2^19091020 is an apocalyptic number.

19091020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19091020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21831264).

19091020 is an abundant number, since it is smaller than the sum of its proper divisors (24571508).

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

19091020 is a wasteful number, since it uses less digits than its factorization.

19091020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850 (or 848 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 19091020 is about 4369.3271793264. The cubic root of 19091020 is about 267.2655878709.

The spelling of 19091020 in words is "nineteen million, ninety-one thousand, twenty".