20930550 has 24 divisors (see below), whose sum is σ = 51908136. Its totient is φ = 5581440.

The previous prime is 20930513. The next prime is 20930579. The reversal of 20930550 is 5503902.

It is a self number, because there is not a number n which added to its sum of digits gives 20930550.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69619 + ... + 69918.

It is an arithmetic number, because the mean of its divisors is an integer number (2162839).

Almost surely, 2^20930550 is an apocalyptic number.

20930550 is an abundant number, since it is smaller than the sum of its proper divisors (30977586).

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

20930550 is a wasteful number, since it uses less digits than its factorization.

20930550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139552 (or 139547 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 24.

The square root of 20930550 is about 4574.9918032713. The cubic root of 20930550 is about 275.5879431981.

The spelling of 20930550 in words is "twenty million, nine hundred thirty thousand, five hundred fifty".