20755572 has 48 divisors (see below), whose sum is σ = 52036992. Its totient is φ = 6415360.

The previous prime is 20755571. The next prime is 20755573. The reversal of 20755572 is 27555702.

It is an interprime number because it is at equal distance from previous prime (20755571) and next prime (20755573).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20755571) 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 15 ways as a sum of consecutive naturals, for example, 13768 + ... + 15200.

It is an arithmetic number, because the mean of its divisors is an integer number (1084104).

Almost surely, 2^20755572 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 20755572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26018496).

20755572 is an abundant number, since it is smaller than the sum of its proper divisors (31281420).

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

20755572 is a wasteful number, since it uses less digits than its factorization.

20755572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528 (or 1526 counting only the distinct ones).

The product of its (nonzero) digits is 24500, while the sum is 33.

The square root of 20755572 is about 4555.8283549756. The cubic root of 20755572 is about 274.8178275567.

The spelling of 20755572 in words is "twenty million, seven hundred fifty-five thousand, five hundred seventy-two".