20961912 has 32 divisors (see below), whose sum is σ = 52519680. Its totient is φ = 6972000.

The previous prime is 20961911. The next prime is 20961929. The reversal of 20961912 is 21916902.

It is a happy number.

It is a super-3 number, since 3×20961912³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20961912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20961911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17443 + ... + 18605.

It is an arithmetic number, because the mean of its divisors is an integer number (1641240).

Almost surely, 2^20961912 is an apocalyptic number.

It is an amenable number.

20961912 is an abundant number, since it is smaller than the sum of its proper divisors (31557768).

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

20961912 is a wasteful number, since it uses less digits than its factorization.

20961912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923 (or 1919 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 20961912 is about 4578.4180674115. The cubic root of 20961912 is about 275.7255200228.

The spelling of 20961912 in words is "twenty million, nine hundred sixty-one thousand, nine hundred twelve".