20625216 has 112 divisors (see below), whose sum is σ = 59253120. Its totient is φ = 6307840.

The previous prime is 20625197. The next prime is 20625217. The reversal of 20625216 is 61252602.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20625217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231700 + ... + 231788.

Almost surely, 2^20625216 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 20625216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29626560).

20625216 is an abundant number, since it is smaller than the sum of its proper divisors (38627904).

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

20625216 is a wasteful number, since it uses less digits than its factorization.

20625216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20625216 is about 4541.4993119013. The cubic root of 20625216 is about 274.2412849663.

Adding to 20625216 its reverse (61252602), we get a palindrome (81877818).

The spelling of 20625216 in words is "twenty million, six hundred twenty-five thousand, two hundred sixteen".