20630021255 has 16 divisors (see below), whose sum is σ = 25166492640. Its totient is φ = 16231176192.

The previous prime is 20630021249. The next prime is 20630021257. The reversal of 20630021255 is 55212003602.

It is a cyclic number.

It is not a de Polignac number, because 20630021255 - 2¹⁰ = 20630020231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20630021257) 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, 156791 + ... + 256599.

It is an arithmetic number, because the mean of its divisors is an integer number (1572905790).

Almost surely, 2^20630021255 is an apocalyptic number.

20630021255 is a deficient number, since it is larger than the sum of its proper divisors (4536471385).

20630021255 is an equidigital number, since it uses as much as digits as its factorization.

20630021255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100498.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 20630021255 its reverse (55212003602), we get a palindrome (75842024857).

The spelling of 20630021255 in words is "twenty billion, six hundred thirty million, twenty-one thousand, two hundred fifty-five".