20501767545 has 64 divisors (see below), whose sum is σ = 37973520384. Its totient is φ = 9251884800.

The previous prime is 20501767511. The next prime is 20501767547. The reversal of 20501767545 is 54576710502.

It is a happy number.

It is not a de Polignac number, because 20501767545 - 2⁸ = 20501767289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20501767497 and 20501767506.

It is not an unprimeable number, because it can be changed into a prime (20501767547) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 2580399 + ... + 2588331.

It is an arithmetic number, because the mean of its divisors is an integer number (593336256).

Almost surely, 2^20501767545 is an apocalyptic number.

It is an amenable number.

20501767545 is a deficient number, since it is larger than the sum of its proper divisors (17471752839).

20501767545 is a wasteful number, since it uses less digits than its factorization.

20501767545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8262.

The product of its (nonzero) digits is 294000, while the sum is 42.

The spelling of 20501767545 in words is "twenty billion, five hundred one million, seven hundred sixty-seven thousand, five hundred forty-five".