20489416851 has 16 divisors (see below), whose sum is σ = 28190586368. Its totient is φ = 13227429600.

The previous prime is 20489416847. The next prime is 20489416867. The reversal of 20489416851 is 15861498402.

It is not a de Polignac number, because 20489416851 - 2² = 20489416847 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 20489416851.

It is not an unprimeable number, because it can be changed into a prime (20489416811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 413995 + ... + 460836.

It is an arithmetic number, because the mean of its divisors is an integer number (1761911648).

Almost surely, 2^20489416851 is an apocalyptic number.

20489416851 is a deficient number, since it is larger than the sum of its proper divisors (7701169517).

20489416851 is a wasteful number, since it uses less digits than its factorization.

20489416851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875082.

The product of its (nonzero) digits is 552960, while the sum is 48.

The spelling of 20489416851 in words is "twenty billion, four hundred eighty-nine million, four hundred sixteen thousand, eight hundred fifty-one".