20212725 has 24 divisors (see below), whose sum is σ = 35990752. Its totient is φ = 9950400.

The previous prime is 20212723. The next prime is 20212729. The reversal of 20212725 is 52721202.

It is a happy number.

It is not a de Polignac number, because 20212725 - 2¹ = 20212723 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9391 + ... + 11340.

Almost surely, 2^20212725 is an apocalyptic number.

20212725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20212725 is a deficient number, since it is larger than the sum of its proper divisors (15778027).

20212725 is a wasteful number, since it uses less digits than its factorization.

20212725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20757 (or 20752 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 20212725 is about 4495.8564256435. The cubic root of 20212725 is about 272.4007438078.

Adding to 20212725 its reverse (52721202), we get a palindrome (72933927).

The spelling of 20212725 in words is "twenty million, two hundred twelve thousand, seven hundred twenty-five".