20101312 has 56 divisors (see below), whose sum is σ = 49743360. Its totient is φ = 7829760.

The previous prime is 20101309. The next prime is 20101331. The reversal of 20101312 is 21310102.

It is a tau number, because it is divible by the number of its divisors (56).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2889 + ... + 6967.

Almost surely, 2^20101312 is an apocalyptic number.

20101312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20101312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24871680).

20101312 is an abundant number, since it is smaller than the sum of its proper divisors (29642048).

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

20101312 is a wasteful number, since it uses less digits than its factorization.

20101312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4109 (or 4099 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20101312 is about 4483.4486726180. The cubic root of 20101312 is about 271.8993283730.

Adding to 20101312 its reverse (21310102), we get a palindrome (41411414).

The spelling of 20101312 in words is "twenty million, one hundred one thousand, three hundred twelve".