20725227 has 48 divisors (see below), whose sum is σ = 34201440. Its totient is φ = 12483072.

The previous prime is 20725171. The next prime is 20725241. The reversal of 20725227 is 72252702.

It is a happy number.

It is not a de Polignac number, because 20725227 - 2¹² = 20721131 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 20725227.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20725247) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 119713 + ... + 119885.

It is an arithmetic number, because the mean of its divisors is an integer number (712530).

Almost surely, 2^20725227 is an apocalyptic number.

20725227 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20725227 is a deficient number, since it is larger than the sum of its proper divisors (13476213).

20725227 is a wasteful number, since it uses less digits than its factorization.

20725227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 27.

The square root of 20725227 is about 4552.4967874783. The cubic root of 20725227 is about 274.6838327854.

Adding to 20725227 its reverse (72252702), we get a palindrome (92977929).

The spelling of 20725227 in words is "twenty million, seven hundred twenty-five thousand, two hundred twenty-seven".