20091550 has 24 divisors (see below), whose sum is σ = 39339000. Its totient is φ = 7613280.

The previous prime is 20091541. The next prime is 20091551. The reversal of 20091550 is 5519002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20091551) 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, 9625 + ... + 11524.

It is an arithmetic number, because the mean of its divisors is an integer number (1639125).

Almost surely, 2^20091550 is an apocalyptic number.

20091550 is a deficient number, since it is larger than the sum of its proper divisors (19247450).

20091550 is a wasteful number, since it uses less digits than its factorization.

20091550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21180 (or 21175 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 20091550 is about 4482.3598695330. The cubic root of 20091550 is about 271.8553061879.

The spelling of 20091550 in words is "twenty million, ninety-one thousand, five hundred fifty".