20111490 has 80 divisors (see below), whose sum is σ = 61820352. Its totient is φ = 4595616.

The previous prime is 20111489. The next prime is 20111491. The reversal of 20111490 is 9411102.

It is an interprime number because it is at equal distance from previous prime (20111489) and next prime (20111491).

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

It is not an unprimeable number, because it can be changed into a prime (20111491) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3897 + ... + 7443.

Almost surely, 2^20111490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20111490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30910176).

20111490 is an abundant number, since it is smaller than the sum of its proper divisors (41708862).

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

20111490 is a wasteful number, since it uses less digits than its factorization.

20111490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3573 (or 3564 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 20111490 is about 4484.5835927096. The cubic root of 20111490 is about 271.9452113552.

Adding to 20111490 its reverse (9411102), we get a palindrome (29522592).

The spelling of 20111490 in words is "twenty million, one hundred eleven thousand, four hundred ninety".