20123724 has 24 divisors (see below), whose sum is σ = 47204080. Its totient is φ = 6672384.

The previous prime is 20123713. The next prime is 20123737. The reversal of 20123724 is 42732102.

It is a self number, because there is not a number n which added to its sum of digits gives 20123724.

It is a congruent number.

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, 2029 + ... + 6660.

Almost surely, 2^20123724 is an apocalyptic number.

It is an amenable number.

20123724 is an abundant number, since it is smaller than the sum of its proper divisors (27080356).

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

20123724 is a wasteful number, since it uses less digits than its factorization.

20123724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8889 (or 8887 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20123724 is about 4485.9473915774. The cubic root of 20123724 is about 272.0003424159. Note that the first 3 decimals are identical.

Adding to 20123724 its reverse (42732102), we get a palindrome (62855826).

The spelling of 20123724 in words is "twenty million, one hundred twenty-three thousand, seven hundred twenty-four".