20027002251 has 16 divisors (see below), whose sum is σ = 27475886880. Its totient is φ = 12969715200.

The previous prime is 20027002217. The next prime is 20027002283. The reversal of 20027002251 is 15220072002.

It is a happy number.

It is not a de Polignac number, because 20027002251 - 2⁶ = 20027002187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20027002211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 607486 + ... + 639603.

It is an arithmetic number, because the mean of its divisors is an integer number (1717242930).

Almost surely, 2^20027002251 is an apocalyptic number.

20027002251 is a deficient number, since it is larger than the sum of its proper divisors (7448884629).

20027002251 is a wasteful number, since it uses less digits than its factorization.

20027002251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247246.

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

Adding to 20027002251 its reverse (15220072002), we get a palindrome (35247074253).

The spelling of 20027002251 in words is "twenty billion, twenty-seven million, two thousand, two hundred fifty-one".