20192020 has 12 divisors (see below), whose sum is σ = 42403284. Its totient is φ = 8076800.

The previous prime is 20191987. The next prime is 20192023. The reversal of 20192020 is 2029102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4605316 + 15586704 = 2146^2 + 3948^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20191985 and 20192003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20192023) 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, 504781 + ... + 504820.

It is an arithmetic number, because the mean of its divisors is an integer number (3533607).

Almost surely, 2^20192020 is an apocalyptic number.

20192020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20192020 is an abundant number, since it is smaller than the sum of its proper divisors (22211264).

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

20192020 is a wasteful number, since it uses less digits than its factorization.

20192020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009610 (or 1009608 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 20192020 is about 4493.5531598057. The cubic root of 20192020 is about 272.3077003694.

The spelling of 20192020 in words is "twenty million, one hundred ninety-two thousand, twenty".