20285740 has 12 divisors (see below), whose sum is σ = 42600096. Its totient is φ = 8114288.

The previous prime is 20285737. The next prime is 20285753. The reversal of 20285740 is 4758202.

It is a super-2 number, since 2×20285740² = 823022494695200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20285699 and 20285708.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 507124 + ... + 507163.

It is an arithmetic number, because the mean of its divisors is an integer number (3550008).

Almost surely, 2^20285740 is an apocalyptic number.

20285740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20285740 is an abundant number, since it is smaller than the sum of its proper divisors (22314356).

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

20285740 is a wasteful number, since it uses less digits than its factorization.

20285740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014296 (or 1014294 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 20285740 is about 4503.9693604642. The cubic root of 20285740 is about 272.7283499621.

It can be divided in two parts, 20285 and 740, that added together give a square (21025 = 145²).

The spelling of 20285740 in words is "twenty million, two hundred eighty-five thousand, seven hundred forty".