20451547011 has 16 divisors (see below), whose sum is σ = 32238892800. Its totient is φ = 11283611808.

The previous prime is 20451547001. The next prime is 20451547021. The reversal of 20451547011 is 11074515402.

It is an interprime number because it is at equal distance from previous prime (20451547001) and next prime (20451547021).

It is not a de Polignac number, because 20451547011 - 2⁷ = 20451546883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20451547011.

It is not an unprimeable number, because it can be changed into a prime (20451547001) 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, 16790481 + ... + 16791698.

It is an arithmetic number, because the mean of its divisors is an integer number (2014930800).

Almost surely, 2^20451547011 is an apocalyptic number.

20451547011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20451547011 is a deficient number, since it is larger than the sum of its proper divisors (11787345789).

20451547011 is a wasteful number, since it uses less digits than its factorization.

20451547011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33582218.

The product of its (nonzero) digits is 5600, while the sum is 30.

The spelling of 20451547011 in words is "twenty billion, four hundred fifty-one million, five hundred forty-seven thousand, eleven".