19000020 has 48 divisors (see below), whose sum is σ = 57294720. Its totient is φ = 4676736.

The previous prime is 19000013. The next prime is 19000027. The reversal of 19000020 is 2000091.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19000013) and next prime (19000027).

It is a super-2 number, since 2×19000020² = 722001520000800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19000027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11400 + ... + 12959.

It is an arithmetic number, because the mean of its divisors is an integer number (1193640).

Almost surely, 2^19000020 is an apocalyptic number.

19000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19000020 is an abundant number, since it is smaller than the sum of its proper divisors (38294700).

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

19000020 is a wasteful number, since it uses less digits than its factorization.

19000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24384 (or 24382 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 19000020 is about 4358.9012376974. The cubic root of 19000020 is about 266.8402585003.

The spelling of 19000020 in words is "nineteen million, twenty", and thus it is an aban number and an uban number.