20541506720 has 48 divisors (see below), whose sum is σ = 55462071168. Its totient is φ = 7042801920.

The previous prime is 20541506717. The next prime is 20541506731. The reversal of 20541506720 is 2760514502.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9169196 + ... + 9171435.

It is an arithmetic number, because the mean of its divisors is an integer number (1155459816).

Almost surely, 2^20541506720 is an apocalyptic number.

20541506720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20541506720 is an abundant number, since it is smaller than the sum of its proper divisors (34920564448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20541506720 is a wasteful number, since it uses less digits than its factorization.

20541506720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18340653 (or 18340645 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The spelling of 20541506720 in words is "twenty billion, five hundred forty-one million, five hundred six thousand, seven hundred twenty".