20530744 has 32 divisors (see below), whose sum is σ = 41847120. Its totient is φ = 9386496.

The previous prime is 20530723. The next prime is 20530759. The reversal of 20530744 is 44703502.

It is a super-2 number, since 2×20530744² = 843022898387072, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 10879 + ... + 12625.

Almost surely, 2^20530744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20530744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20923560).

20530744 is an abundant number, since it is smaller than the sum of its proper divisors (21316376).

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

20530744 is a wasteful number, since it uses less digits than its factorization.

20530744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1879 (or 1875 counting only the distinct ones).

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

The square root of 20530744 is about 4531.0864039433. The cubic root of 20530744 is about 273.8219312931.

The spelling of 20530744 in words is "twenty million, five hundred thirty thousand, seven hundred forty-four".