20533871643728 has 40 divisors (see below), whose sum is σ = 41878921735200. Its totient is φ = 9726424251264.

The previous prime is 20533871643697. The next prime is 20533871643749. The reversal of 20533871643728 is 82734617833502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21229175 + ... + 22175337.

It is an arithmetic number, because the mean of its divisors is an integer number (1046973043380).

Almost surely, 2^{20533871643728} is an apocalyptic number.

It is an amenable number.

20533871643728 is an abundant number, since it is smaller than the sum of its proper divisors (21345050091472).

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

20533871643728 is a wasteful number, since it uses less digits than its factorization.

20533871643728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017579 (or 1017573 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 59.

The spelling of 20533871643728 in words is "twenty trillion, five hundred thirty-three billion, eight hundred seventy-one million, six hundred forty-three thousand, seven hundred twenty-eight".