20597550 has 48 divisors (see below), whose sum is σ = 51358320. Its totient is φ = 5463040.

The previous prime is 20597543. The next prime is 20597561. The reversal of 20597550 is 5579502.

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 23 ways as a sum of consecutive naturals, for example, 52756 + ... + 53144.

It is an arithmetic number, because the mean of its divisors is an integer number (1069965).

Almost surely, 2^20597550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20597550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25679160).

20597550 is an abundant number, since it is smaller than the sum of its proper divisors (30760770).

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

20597550 is a wasteful number, since it uses less digits than its factorization.

20597550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757 (or 752 counting only the distinct ones).

The product of its (nonzero) digits is 15750, while the sum is 33.

The square root of 20597550 is about 4538.4523793910. The cubic root of 20597550 is about 274.1186106259.

The spelling of 20597550 in words is "twenty million, five hundred ninety-seven thousand, five hundred fifty".