20539550 has 24 divisors (see below), whose sum is σ = 38367336. Its totient is φ = 8180640.

The previous prime is 20539537. The next prime is 20539579. The reversal of 20539550 is 5593502.

It is a super-2 number, since 2×20539550² = 843746228405000, which contains 22 as substring.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 13109 + ... + 14591.

It is an arithmetic number, because the mean of its divisors is an integer number (1598639).

Almost surely, 2^20539550 is an apocalyptic number.

20539550 is a deficient number, since it is larger than the sum of its proper divisors (17827786).

20539550 is a wasteful number, since it uses less digits than its factorization.

20539550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772 (or 1767 counting only the distinct ones).

The product of its (nonzero) digits is 6750, while the sum is 29.

The square root of 20539550 is about 4532.0580314025. The cubic root of 20539550 is about 273.8610747238.

The spelling of 20539550 in words is "twenty million, five hundred thirty-nine thousand, five hundred fifty".