20500104636451 has 8 divisors (see below), whose sum is σ = 23336087491584. Its totient is φ = 17826177944520.

The previous prime is 20500104636439. The next prime is 20500104636463. The reversal of 20500104636451 is 15463640100502.

It is an interprime number because it is at equal distance from previous prime (20500104636439) and next prime (20500104636463).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20500104636451 - 2²⁷ = 20499970418723 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20500104636451.

It is not an unprimeable number, because it can be changed into a prime (20500104636751) 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 7 ways as a sum of consecutive naturals, for example, 40514040531 + ... + 40514041036.

It is an arithmetic number, because the mean of its divisors is an integer number (2917010936448).

Almost surely, 2^{20500104636451} is an apocalyptic number.

20500104636451 is a deficient number, since it is larger than the sum of its proper divisors (2835982855133).

20500104636451 is a wasteful number, since it uses less digits than its factorization.

20500104636451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81028081601.

The product of its (nonzero) digits is 86400, while the sum is 37.

Adding to 20500104636451 its reverse (15463640100502), we get a palindrome (35963744736953).

The spelling of 20500104636451 in words is "twenty trillion, five hundred billion, one hundred four million, six hundred thirty-six thousand, four hundred fifty-one".