20355550 has 24 divisors (see below), whose sum is σ = 38888136. Its totient is φ = 7921440.

The previous prime is 20355541. The next prime is 20355553. The reversal of 20355550 is 5555302.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3652 + ... + 7351.

It is an arithmetic number, because the mean of its divisors is an integer number (1620339).

Almost surely, 2^20355550 is an apocalyptic number.

20355550 is a deficient number, since it is larger than the sum of its proper divisors (18532586).

20355550 is a wasteful number, since it uses less digits than its factorization.

20355550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11052 (or 11047 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 25.

The square root of 20355550 is about 4511.7125351689. The cubic root of 20355550 is about 273.0408415239.

The spelling of 20355550 in words is "twenty million, three hundred fifty-five thousand, five hundred fifty".