20426650551 has 20 divisors (see below), whose sum is σ = 30532051000. Its totient is φ = 13609660176.

The previous prime is 20426650537. The next prime is 20426650561. The reversal of 20426650551 is 15505662402.

20426650551 is a `hidden beast` number, since 2 + 0 + 42 + 6 + 65 + 0 + 551 = 666.

It is not a de Polignac number, because 20426650551 - 2⁶ = 20426650487 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 (20426650501) 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 19 ways as a sum of consecutive naturals, for example, 63405 + ... + 211833.

It is an arithmetic number, because the mean of its divisors is an integer number (1526602550).

Almost surely, 2^20426650551 is an apocalyptic number.

20426650551 is a deficient number, since it is larger than the sum of its proper divisors (10105400449).

20426650551 is a wasteful number, since it uses less digits than its factorization.

20426650551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150140 (or 150131 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 20426650551 in words is "twenty billion, four hundred twenty-six million, six hundred fifty thousand, five hundred fifty-one".