20535121845 has 96 divisors (see below), whose sum is σ = 41192865792. Its totient is φ = 9269479296.

The previous prime is 20535121813. The next prime is 20535121883. The reversal of 20535121845 is 54812153502.

20535121845 is a `hidden beast` number, since 20 + 535 + 1 + 21 + 84 + 5 = 666.

It is not a de Polignac number, because 20535121845 - 2⁵ = 20535121813 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15021352 + ... + 15022718.

It is an arithmetic number, because the mean of its divisors is an integer number (429092352).

Almost surely, 2^20535121845 is an apocalyptic number.

It is an amenable number.

20535121845 is an abundant number, since it is smaller than the sum of its proper divisors (20657743947).

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

20535121845 is a wasteful number, since it uses less digits than its factorization.

20535121845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951 (or 1948 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The spelling of 20535121845 in words is "twenty billion, five hundred thirty-five million, one hundred twenty-one thousand, eight hundred forty-five".