20959550 has 12 divisors (see below), whose sum is σ = 38984856. Its totient is φ = 8383800.

The previous prime is 20959537. The next prime is 20959567. The reversal of 20959550 is 5595902.

It is a self number, because there is not a number n which added to its sum of digits gives 20959550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 209546 + ... + 209645.

It is an arithmetic number, because the mean of its divisors is an integer number (3248738).

Almost surely, 2^20959550 is an apocalyptic number.

20959550 is a deficient number, since it is larger than the sum of its proper divisors (18025306).

20959550 is a wasteful number, since it uses less digits than its factorization.

20959550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419203 (or 419198 counting only the distinct ones).

The product of its (nonzero) digits is 20250, while the sum is 35.

The square root of 20959550 is about 4578.1601107869. The cubic root of 20959550 is about 275.7151633317.

The spelling of 20959550 in words is "twenty million, nine hundred fifty-nine thousand, five hundred fifty".