20910012 has 12 divisors (see below), whose sum is σ = 48790056. Its totient is φ = 6970000.

The previous prime is 20910011. The next prime is 20910023. The reversal of 20910012 is 21001902.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 20909973 and 20910000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20910011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 871239 + ... + 871262.

It is an arithmetic number, because the mean of its divisors is an integer number (4065838).

Almost surely, 2^20910012 is an apocalyptic number.

It is an amenable number.

20910012 is an abundant number, since it is smaller than the sum of its proper divisors (27880044).

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

20910012 is a wasteful number, since it uses less digits than its factorization.

20910012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1742508 (or 1742506 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 20910012 is about 4572.7466581913. The cubic root of 20910012 is about 275.4977739243.

Adding to 20910012 its reverse (21001902), we get a palindrome (41911914).

The spelling of 20910012 in words is "twenty million, nine hundred ten thousand, twelve".