19121020 has 12 divisors (see below), whose sum is σ = 40154184. Its totient is φ = 7648400.

The previous prime is 19120987. The next prime is 19121029. The reversal of 19121020 is 2012191.

It is a super-2 number, since 2×19121020² = 731226811680800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19120985 and 19121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19121029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 478006 + ... + 478045.

It is an arithmetic number, because the mean of its divisors is an integer number (3346182).

Almost surely, 2^19121020 is an apocalyptic number.

19121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19121020 is an abundant number, since it is smaller than the sum of its proper divisors (21033164).

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

19121020 is a wasteful number, since it uses less digits than its factorization.

19121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956060 (or 956058 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 19121020 is about 4372.7588545448. The cubic root of 19121020 is about 267.4055100514.

The spelling of 19121020 in words is "nineteen million, one hundred twenty-one thousand, twenty".