20528172 has 108 divisors (see below), whose sum is σ = 62527920. Its totient is φ = 5556096.

The previous prime is 20528171. The next prime is 20528203. The reversal of 20528172 is 27182502.

It is a super-3 number, since 3×20528172³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (20528171) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 387298 + ... + 387350.

Almost surely, 2^20528172 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 20528172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31263960).

20528172 is an abundant number, since it is smaller than the sum of its proper divisors (41999748).

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

20528172 is a wasteful number, since it uses less digits than its factorization.

20528172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20528172 is about 4530.8025779105. The cubic root of 20528172 is about 273.8104964190.

The spelling of 20528172 in words is "twenty million, five hundred twenty-eight thousand, one hundred seventy-two".