20072550 has 48 divisors (see below), whose sum is σ = 52407360. Its totient is φ = 5070240.

The previous prime is 20072543. The next prime is 20072561. The reversal of 20072550 is 5527002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 672 + ... + 6371.

It is an arithmetic number, because the mean of its divisors is an integer number (1091820).

Almost surely, 2^20072550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20072550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26203680).

20072550 is an abundant number, since it is smaller than the sum of its proper divisors (32334810).

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

20072550 is a wasteful number, since it uses less digits than its factorization.

20072550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7077 (or 7072 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 21.

The square root of 20072550 is about 4480.2399489313. The cubic root of 20072550 is about 271.7695839168.

Adding to 20072550 its reverse (5527002), we get a palindrome (25599552).

The spelling of 20072550 in words is "twenty million, seventy-two thousand, five hundred fifty".