20285940 has 48 divisors (see below), whose sum is σ = 56996352. Its totient is φ = 5390976.

The previous prime is 20285933. The next prime is 20285963. The reversal of 20285940 is 4958202.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20285898 and 20285907.

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 15 ways as a sum of consecutive naturals, for example, 33117 + ... + 33723.

It is an arithmetic number, because the mean of its divisors is an integer number (1187424).

Almost surely, 2^20285940 is an apocalyptic number.

20285940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20285940 is an abundant number, since it is smaller than the sum of its proper divisors (36710412).

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

20285940 is a wasteful number, since it uses less digits than its factorization.

20285940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176 (or 1174 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20285940 is about 4503.9915630472. The cubic root of 20285940 is about 272.7292462483.

The spelling of 20285940 in words is "twenty million, two hundred eighty-five thousand, nine hundred forty".