20121924 has 12 divisors (see below), whose sum is σ = 46951184. Its totient is φ = 6707304.

The previous prime is 20121923. The next prime is 20121947. The reversal of 20121924 is 42912102.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20121924.

It is not an unprimeable number, because it can be changed into a prime (20121923) 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, 838402 + ... + 838425.

Almost surely, 2^20121924 is an apocalyptic number.

It is an amenable number.

20121924 is an abundant number, since it is smaller than the sum of its proper divisors (26829260).

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

20121924 is a wasteful number, since it uses less digits than its factorization.

20121924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676834 (or 1676832 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 20121924 is about 4485.7467605740. The cubic root of 20121924 is about 271.9922323330.

The spelling of 20121924 in words is "twenty million, one hundred twenty-one thousand, nine hundred twenty-four".