20471572 has 24 divisors (see below), whose sum is σ = 39638592. Its totient is φ = 9172800.

The previous prime is 20471497. The next prime is 20471579. The reversal of 20471572 is 27517402.

It is a self number, because there is not a number n which added to its sum of digits gives 20471572.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20471579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153 + ... + 6400.

It is an arithmetic number, because the mean of its divisors is an integer number (1651608).

Almost surely, 2^20471572 is an apocalyptic number.

20471572 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20471572 is a deficient number, since it is larger than the sum of its proper divisors (19167020).

20471572 is a wasteful number, since it uses less digits than its factorization.

20471572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6639 (or 6637 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 20471572 is about 4524.5521325320. The cubic root of 20471572 is about 273.5586159093.

Adding to 20471572 its reverse (27517402), we get a palindrome (47988974).

The spelling of 20471572 in words is "twenty million, four hundred seventy-one thousand, five hundred seventy-two".