20573440 has 36 divisors (see below), whose sum is σ = 49282884. Its totient is φ = 8228864.

The previous prime is 20573411. The next prime is 20573453. The reversal of 20573440 is 4437502.

It can be written as a sum of positive squares in 2 ways, for example, as 5456896 + 15116544 = 2336^2 + 3888^2 .

It is a congruent number.

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, 6757 + ... + 9316.

It is an arithmetic number, because the mean of its divisors is an integer number (1368969).

Almost surely, 2^20573440 is an apocalyptic number.

20573440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20573440 is an abundant number, since it is smaller than the sum of its proper divisors (28709444).

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

20573440 is an equidigital number, since it uses as much as digits as its factorization.

20573440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16094 (or 16080 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 20573440 is about 4535.7954098482. The cubic root of 20573440 is about 274.0116144046.

The spelling of 20573440 in words is "twenty million, five hundred seventy-three thousand, four hundred forty".