20505154545 has 24 divisors (see below), whose sum is σ = 35563320000. Its totient is φ = 10929604896.

The previous prime is 20505154543. The next prime is 20505154547. The reversal of 20505154545 is 54545150502.

20505154545 is a `hidden beast` number, since 20 + 5 + 0 + 51 + 545 + 45 = 666.

It is an interprime number because it is at equal distance from previous prime (20505154543) and next prime (20505154547).

It is not a de Polignac number, because 20505154545 - 2¹ = 20505154543 is a prime.

It is a super-2 number, since 2×20505154545² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20505154541) 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 23 ways as a sum of consecutive naturals, for example, 57645 + ... + 210554.

It is an arithmetic number, because the mean of its divisors is an integer number (1481805000).

Almost surely, 2^20505154545 is an apocalyptic number.

It is an amenable number.

20505154545 is a deficient number, since it is larger than the sum of its proper divisors (15058165455).

20505154545 is a wasteful number, since it uses less digits than its factorization.

20505154545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269909 (or 269906 counting only the distinct ones).

The product of its (nonzero) digits is 100000, while the sum is 36.

The spelling of 20505154545 in words is "twenty billion, five hundred five million, one hundred fifty-four thousand, five hundred forty-five".