20389420923840 has 112 divisors (see below), whose sum is σ = 71929346067360. Its totient is φ = 5437178910720.

The previous prime is 20389420923821. The next prime is 20389420923853. The reversal of 20389420923840 is 4832902498302.

20389420923840 is a `hidden beast` number, since 2 + 0 + 389 + 4 + 20 + 9 + 238 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1179934701 + ... + 1179951980.

Almost surely, 2^{20389420923840} is an apocalyptic number.

20389420923840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20389420923840 is an abundant number, since it is smaller than the sum of its proper divisors (51539925143520).

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

20389420923840 is a wasteful number, since it uses less digits than its factorization.

20389420923840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2359886707 (or 2359886691 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 54.

The spelling of 20389420923840 in words is "twenty trillion, three hundred eighty-nine billion, four hundred twenty million, nine hundred twenty-three thousand, eight hundred forty".