20450020 has 12 divisors (see below), whose sum is σ = 42945084. Its totient is φ = 8180000.

The previous prime is 20450009. The next prime is 20450033. The reversal of 20450020 is 2005402.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15539364 + 4910656 = 3942^2 + 2216^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511231 + ... + 511270.

It is an arithmetic number, because the mean of its divisors is an integer number (3578757).

Almost surely, 2^20450020 is an apocalyptic number.

20450020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20450020 is an abundant number, since it is smaller than the sum of its proper divisors (22495064).

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

20450020 is a wasteful number, since it uses less digits than its factorization.

20450020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022510 (or 1022508 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 20450020 is about 4522.1698331664. The cubic root of 20450020 is about 273.4625834622.

Adding to 20450020 its reverse (2005402), we get a palindrome (22455422).

The spelling of 20450020 in words is "twenty million, four hundred fifty thousand, twenty".