20190000 has 100 divisors (see below), whose sum is σ = 65272856. Its totient is φ = 5376000.

The previous prime is 20189971. The next prime is 20190013. The reversal of 20190000 is 9102.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (100).

It is a super-2 number, since 2×20190000² = 815272200000000, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 29664 + ... + 30336.

Almost surely, 2^20190000 is an apocalyptic number.

20190000 is a gapful number since it is divisible by the number (20) 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 20190000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32636428).

20190000 is an abundant number, since it is smaller than the sum of its proper divisors (45082856).

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

20190000 is an equidigital number, since it uses as much as digits as its factorization.

20190000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704 (or 683 counting only the distinct ones).

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

The square root of 20190000 is about 4493.3283877322. The cubic root of 20190000 is about 272.2986195559.

Adding to 20190000 its reverse (9102), we get a palindrome (20199102).

The spelling of 20190000 in words is "twenty million, one hundred ninety thousand".