20011284 has 36 divisors (see below), whose sum is σ = 51664704. Its totient is φ = 6527952.

The previous prime is 20011273. The next prime is 20011289. The reversal of 20011284 is 48211002.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4222 + ... + 7605.

Almost surely, 2^20011284 is an apocalyptic number.

It is an amenable number.

20011284 is an abundant number, since it is smaller than the sum of its proper divisors (31653420).

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

20011284 is a wasteful number, since it uses less digits than its factorization.

20011284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11884 (or 11879 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 20011284 is about 4473.3973666555. The cubic root of 20011284 is about 271.4928012092.

Adding to 20011284 its reverse (48211002), we get a palindrome (68222286).

The spelling of 20011284 in words is "twenty million, eleven thousand, two hundred eighty-four".