20011012 has 54 divisors (see below), whose sum is σ = 42805518. Its totient is φ = 8160768.

The previous prime is 20011007. The next prime is 20011031. The reversal of 20011012 is 21011002.

It can be written as a sum of positive squares in only one way, i.e., 14930496 + 5080516 = 3864^2 + 2254^2 .

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a junction number, because it is equal to n+sod(n) for n = 20010986 and 20011004.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 103588 + ... + 103780.

Almost surely, 2^20011012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20011012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21402759).

20011012 is an abundant number, since it is smaller than the sum of its proper divisors (22794506).

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

20011012 is a wasteful number, since it uses less digits than its factorization.

20011012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 20011012 is about 4473.3669646028. The cubic root of 20011012 is about 271.4915711302.

Adding to 20011012 its reverse (21011002), we get a palindrome (41022014).

The spelling of 20011012 in words is "twenty million, eleven thousand, twelve".