20280020 has 24 divisors (see below), whose sum is σ = 44440704. Its totient is φ = 7759136.

The previous prime is 20280017. The next prime is 20280059. The reversal of 20280020 is 2008202.

It is a super-2 number, since 2×20280020² = 822558422400800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20279977 and 20280004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21584 + ... + 22503.

It is an arithmetic number, because the mean of its divisors is an integer number (1851696).

Almost surely, 2^20280020 is an apocalyptic number.

20280020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20280020 is an abundant number, since it is smaller than the sum of its proper divisors (24160684).

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

20280020 is a wasteful number, since it uses less digits than its factorization.

20280020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44119 (or 44117 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 20280020 is about 4503.3343202565. The cubic root of 20280020 is about 272.7027136808.

Adding to 20280020 its reverse (2008202), we get a palindrome (22288222).

The spelling of 20280020 in words is "twenty million, two hundred eighty thousand, twenty".