20539330 has 48 divisors (see below), whose sum is σ = 43436736. Its totient is φ = 6972000.

The previous prime is 20539307. The next prime is 20539357. The reversal of 20539330 is 3393502.

20539330 = T₈₉₁ + T₈₉₂ + ... + T₉₃₉.

It is a junction number, because it is equal to n+sod(n) for n = 20539295 and 20539304.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 81705 + ... + 81955.

It is an arithmetic number, because the mean of its divisors is an integer number (904932).

Almost surely, 2^20539330 is an apocalyptic number.

20539330 is an abundant number, since it is smaller than the sum of its proper divisors (22897406).

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

20539330 is a wasteful number, since it uses less digits than its factorization.

20539330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 432 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 25.

The square root of 20539330 is about 4532.0337598036. The cubic root of 20539330 is about 273.8600969411.

The spelling of 20539330 in words is "twenty million, five hundred thirty-nine thousand, three hundred thirty".