20611572 has 12 divisors (see below), whose sum is σ = 48093696. Its totient is φ = 6870520.

The previous prime is 20611571. The next prime is 20611583. The reversal of 20611572 is 27511602.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×20611572² = 849673800622368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20611571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 858804 + ... + 858827.

It is an arithmetic number, because the mean of its divisors is an integer number (4007808).

Almost surely, 2^20611572 is an apocalyptic number.

It is an amenable number.

20611572 is an abundant number, since it is smaller than the sum of its proper divisors (27482124).

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

20611572 is a wasteful number, since it uses less digits than its factorization.

20611572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1717638 (or 1717636 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 20611572 is about 4539.9969162985. The cubic root of 20611572 is about 274.1807995638.

It can be divided in two parts, 206 and 11572, that multiplied together give a palindrome (2383832).

The spelling of 20611572 in words is "twenty million, six hundred eleven thousand, five hundred seventy-two".