20404036500551 has 32 divisors (see below), whose sum is σ = 23140147827456. Its totient is φ = 17979439077600.

The previous prime is 20404036500509. The next prime is 20404036500581. The reversal of 20404036500551 is 15500563040402.

It is not a de Polignac number, because 20404036500551 - 2⁶ = 20404036500487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404036500581) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6136805 + ... + 8858241.

It is an arithmetic number, because the mean of its divisors is an integer number (723129619608).

Almost surely, 2^{20404036500551} is an apocalyptic number.

20404036500551 is a deficient number, since it is larger than the sum of its proper divisors (2736111326905).

20404036500551 is a wasteful number, since it uses less digits than its factorization.

20404036500551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2721644 (or 2721622 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

Adding to 20404036500551 its reverse (15500563040402), we get a palindrome (35904599540953).

The spelling of 20404036500551 in words is "twenty trillion, four hundred four billion, thirty-six million, five hundred thousand, five hundred fifty-one".