20044401551 has 2 divisors, whose sum is σ = 20044401552. Its totient is φ = 20044401550.

The previous prime is 20044401527. The next prime is 20044401617. The reversal of 20044401551 is 15510444002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20044401551 - 2¹⁰ = 20044400527 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20044401551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20044401851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10022200775 + 10022200776.

It is an arithmetic number, because the mean of its divisors is an integer number (10022200776).

Almost surely, 2^20044401551 is an apocalyptic number.

20044401551 is a deficient number, since it is larger than the sum of its proper divisors (1).

20044401551 is an equidigital number, since it uses as much as digits as its factorization.

20044401551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 20044401551 its reverse (15510444002), we get a palindrome (35554845553).

The spelling of 20044401551 in words is "twenty billion, forty-four million, four hundred one thousand, five hundred fifty-one".