20768550 has 96 divisors (see below), whose sum is σ = 57746304. Its totient is φ = 4896000.

The previous prime is 20768549. The next prime is 20768551. The reversal of 20768550 is 5586702.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20768549) and next prime (20768551).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20768551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67497 + ... + 67803.

It is an arithmetic number, because the mean of its divisors is an integer number (601524).

Almost surely, 2^20768550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20768550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28873152).

20768550 is an abundant number, since it is smaller than the sum of its proper divisors (36977754).

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

20768550 is a wasteful number, since it uses less digits than its factorization.

20768550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 369 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 20768550 is about 4557.2524617361. The cubic root of 20768550 is about 274.8750947917.

The spelling of 20768550 in words is "twenty million, seven hundred sixty-eight thousand, five hundred fifty".