20818532 has 18 divisors (see below), whose sum is σ = 42380982. Its totient is φ = 8922144.

The previous prime is 20818517. The next prime is 20818537. The reversal of 20818532 is 23581802.

It can be written as a sum of positive squares in only one way, i.e., 14182756 + 6635776 = 3766^2 + 2576^2 .

It is a super-2 number, since 2×20818532² = 866822549270048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20818495 and 20818504.

It is not an unprimeable number, because it can be changed into a prime (20818537) 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 5 ways as a sum of consecutive naturals, for example, 52913 + ... + 53304.

It is an arithmetic number, because the mean of its divisors is an integer number (2354499).

Almost surely, 2^20818532 is an apocalyptic number.

It is an amenable number.

20818532 is an abundant number, since it is smaller than the sum of its proper divisors (21562450).

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

20818532 is a wasteful number, since it uses less digits than its factorization.

20818532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106235 (or 106226 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 20818532 is about 4562.7329529570. The cubic root of 20818532 is about 275.0954247351.

The spelling of 20818532 in words is "twenty million, eight hundred eighteen thousand, five hundred thirty-two".