20575840 has 24 divisors (see below), whose sum is σ = 48610800. Its totient is φ = 8230272.

The previous prime is 20575817. The next prime is 20575843. The reversal of 20575840 is 4857502.

It is a super-3 number, since 3×20575840³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20575843) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 64140 + ... + 64459.

It is an arithmetic number, because the mean of its divisors is an integer number (2025450).

Almost surely, 2^20575840 is an apocalyptic number.

20575840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20575840 is an abundant number, since it is smaller than the sum of its proper divisors (28034960).

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

20575840 is a wasteful number, since it uses less digits than its factorization.

20575840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128614 (or 128606 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 20575840 is about 4536.0599643303. The cubic root of 20575840 is about 274.0222689557.

The spelling of 20575840 in words is "twenty million, five hundred seventy-five thousand, eight hundred forty".