20187449424 has 80 divisors (see below), whose sum is σ = 59293080000. Its totient is φ = 6572651904.

The previous prime is 20187449423. The next prime is 20187449431. The reversal of 20187449424 is 42494478102.

20187449424 is a `hidden beast` number, since 2 + 0 + 187 + 4 + 49 + 424 = 666.

It is a super-2 number, since 2×20187449424² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20187449424.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20187449423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 524799 + ... + 561950.

It is an arithmetic number, because the mean of its divisors is an integer number (741163500).

Almost surely, 2^20187449424 is an apocalyptic number.

20187449424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20187449424 is an abundant number, since it is smaller than the sum of its proper divisors (39105630576).

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

20187449424 is a wasteful number, since it uses less digits than its factorization.

20187449424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086809 (or 1086797 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The spelling of 20187449424 in words is "twenty billion, one hundred eighty-seven million, four hundred forty-nine thousand, four hundred twenty-four".