20878533 has 32 divisors (see below), whose sum is σ = 35280000. Its totient is φ = 12089088.

The previous prime is 20878523. The next prime is 20878537. The reversal of 20878533 is 33587802.

It is not a de Polignac number, because 20878533 - 2¹⁸ = 20616389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20878537) 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 31 ways as a sum of consecutive naturals, for example, 4218 + ... + 7716.

It is an arithmetic number, because the mean of its divisors is an integer number (1102500).

Almost surely, 2^20878533 is an apocalyptic number.

It is an amenable number.

20878533 is a deficient number, since it is larger than the sum of its proper divisors (14401467).

20878533 is a wasteful number, since it uses less digits than its factorization.

20878533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3538 (or 3532 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 20878533 is about 4569.3033385846. The cubic root of 20878533 is about 275.3594550172.

The spelling of 20878533 in words is "twenty million, eight hundred seventy-eight thousand, five hundred thirty-three".