20285860 has 24 divisors (see below), whose sum is σ = 48686400. Its totient is φ = 6955104.

The previous prime is 20285831. The next prime is 20285869. The reversal of 20285860 is 6858202.

It is a super-2 number, since 2×20285860² = 823032231879200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20285869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72310 + ... + 72589.

It is an arithmetic number, because the mean of its divisors is an integer number (2028600).

Almost surely, 2^20285860 is an apocalyptic number.

20285860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20285860 is an abundant number, since it is smaller than the sum of its proper divisors (28400540).

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

20285860 is a wasteful number, since it uses less digits than its factorization.

20285860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144915 (or 144913 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 20285860 is about 4503.9826820271. The cubic root of 20285860 is about 272.7288877345.

The spelling of 20285860 in words is "twenty million, two hundred eighty-five thousand, eight hundred sixty".