20190020 has 12 divisors (see below), whose sum is σ = 42399084. Its totient is φ = 8076000.

The previous prime is 20190019. The next prime is 20190029. The reversal of 20190020 is 2009102.

It can be written as a sum of positive squares in 2 ways, for example, as 9834496 + 10355524 = 3136^2 + 3218^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20189977 and 20190004.

It is not an unprimeable number, because it can be changed into a prime (20190029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504731 + ... + 504770.

It is an arithmetic number, because the mean of its divisors is an integer number (3533257).

Almost surely, 2^20190020 is an apocalyptic number.

20190020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20190020 is an abundant number, since it is smaller than the sum of its proper divisors (22209064).

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

20190020 is a wasteful number, since it uses less digits than its factorization.

20190020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009510 (or 1009508 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 20190020 is about 4493.3306132534. The cubic root of 20190020 is about 272.2987094680.

Adding to 20190020 its reverse (2009102), we get a palindrome (22199122).

The spelling of 20190020 in words is "twenty million, one hundred ninety thousand, twenty".