20440726551 has 12 divisors (see below), whose sum is σ = 33743421712. Its totient is φ = 11680415136.

The previous prime is 20440726541. The next prime is 20440726561. The reversal of 20440726551 is 15562704402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20440726541) and next prime (20440726561).

It is not a de Polignac number, because 20440726551 - 2⁹ = 20440726039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440726541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162227926 + ... + 162228051.

Almost surely, 2^20440726551 is an apocalyptic number.

20440726551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20440726551 is a deficient number, since it is larger than the sum of its proper divisors (13302695161).

20440726551 is a wasteful number, since it uses less digits than its factorization.

20440726551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324455990 (or 324455987 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

The spelling of 20440726551 in words is "twenty billion, four hundred forty million, seven hundred twenty-six thousand, five hundred fifty-one".