20572530 has 64 divisors (see below), whose sum is σ = 55627776. Its totient is φ = 4824000.

The previous prime is 20572523. The next prime is 20572537. The reversal of 20572530 is 3527502.

It is an interprime number because it is at equal distance from previous prime (20572523) and next prime (20572537).

It is a self number, because there is not a number n which added to its sum of digits gives 20572530.

It is not an unprimeable number, because it can be changed into a prime (20572537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9225 + ... + 11235.

It is an arithmetic number, because the mean of its divisors is an integer number (869184).

Almost surely, 2^20572530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20572530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27813888).

20572530 is an abundant number, since it is smaller than the sum of its proper divisors (35055246).

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

20572530 is a wasteful number, since it uses less digits than its factorization.

20572530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063.

The product of its (nonzero) digits is 2100, while the sum is 24.

The square root of 20572530 is about 4535.6950955725. The cubic root of 20572530 is about 274.0075743373.

The spelling of 20572530 in words is "twenty million, five hundred seventy-two thousand, five hundred thirty".