20753611225 has 12 divisors (see below), whose sum is σ = 25755731116. Its totient is φ = 16589177280.

The previous prime is 20753611223. The next prime is 20753611273. The reversal of 20753611225 is 52211635702.

It can be written as a sum of positive squares in 6 ways, for example, as 1392558489 + 19361052736 = 37317^2 + 139144^2 .

It is not a de Polignac number, because 20753611225 - 2¹ = 20753611223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20753611223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 311862 + ... + 372511.

Almost surely, 2^20753611225 is an apocalyptic number.

20753611225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20753611225 is a deficient number, since it is larger than the sum of its proper divisors (5002119891).

20753611225 is a wasteful number, since it uses less digits than its factorization.

20753611225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685596 (or 685591 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The spelling of 20753611225 in words is "twenty billion, seven hundred fifty-three million, six hundred eleven thousand, two hundred twenty-five".