20501172 has 36 divisors (see below), whose sum is σ = 51962820. Its totient is φ = 6815232.

The previous prime is 20501141. The next prime is 20501183. The reversal of 20501172 is 27110502.

It can be written as a sum of positive squares in 2 ways, for example, as 197136 + 20304036 = 444^2 + 4506^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21604 + ... + 22532.

Almost surely, 2^20501172 is an apocalyptic number.

It is an amenable number.

20501172 is an abundant number, since it is smaller than the sum of its proper divisors (31461648).

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

20501172 is a wasteful number, since it uses less digits than its factorization.

20501172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552 (or 1547 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 20501172 is about 4527.8219929675. The cubic root of 20501172 is about 273.6903992346.

Adding to 20501172 its reverse (27110502), we get a palindrome (47611674).

The spelling of 20501172 in words is "twenty million, five hundred one thousand, one hundred seventy-two".