20910312 has 120 divisors (see below), whose sum is σ = 62229090. Its totient is φ = 6557760.

The previous prime is 20910301. The next prime is 20910343. The reversal of 20910312 is 21301902.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20738916 + 171396 = 4554^2 + 414^2 .

It is a super-2 number, since 2×20910312² = 874482295874688, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 342762 + ... + 342822.

Almost surely, 2^20910312 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 20910312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31114545).

20910312 is an abundant number, since it is smaller than the sum of its proper divisors (41318778).

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

20910312 is a wasteful number, since it uses less digits than its factorization.

20910312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 20910312 is about 4572.7794611155. The cubic root of 20910312 is about 275.4990914581.

The spelling of 20910312 in words is "twenty million, nine hundred ten thousand, three hundred twelve".