20505372 has 12 divisors (see below), whose sum is σ = 47845896. Its totient is φ = 6835120.

The previous prime is 20505361. The next prime is 20505379. The reversal of 20505372 is 27350502.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20505379) 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, 854379 + ... + 854402.

It is an arithmetic number, because the mean of its divisors is an integer number (3987158).

Almost surely, 2^20505372 is an apocalyptic number.

It is an amenable number.

20505372 is an abundant number, since it is smaller than the sum of its proper divisors (27340524).

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

20505372 is a wasteful number, since it uses less digits than its factorization.

20505372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708788 (or 1708786 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 24.

The square root of 20505372 is about 4528.2857683675. The cubic root of 20505372 is about 273.7090879416.

Adding to 20505372 its reverse (27350502), we get a palindrome (47855874).

The spelling of 20505372 in words is "twenty million, five hundred five thousand, three hundred seventy-two".