20911050 has 72 divisors (see below), whose sum is σ = 58032000. Its totient is φ = 5392800.

The previous prime is 20911043. The next prime is 20911067. The reversal of 20911050 is 5011902.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13201 + ... + 14699.

It is an arithmetic number, because the mean of its divisors is an integer number (806000).

Almost surely, 2^20911050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20911050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29016000).

20911050 is an abundant number, since it is smaller than the sum of its proper divisors (37120950).

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

20911050 is a wasteful number, since it uses less digits than its factorization.

20911050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548 (or 1540 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 20911050 is about 4572.8601553076. The cubic root of 20911050 is about 275.5023325373.

Adding to 20911050 its reverse (5011902), we get a palindrome (25922952).

The spelling of 20911050 in words is "twenty million, nine hundred eleven thousand, fifty".