20421650531232 has 144 divisors (see below), whose sum is σ = 61329138631488. Its totient is φ = 6432801914880.

The previous prime is 20421650531213. The next prime is 20421650531257. The reversal of 20421650531232 is 23213505612402.

20421650531232 is a `hidden beast` number, since 2 + 0 + 4 + 21 + 6 + 505 + 3 + 123 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

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 23 ways as a sum of consecutive naturals, for example, 18022369 + ... + 19121952.

It is an arithmetic number, because the mean of its divisors is an integer number (425896796052).

Almost surely, 2^{20421650531232} is an apocalyptic number.

It is an amenable number.

20421650531232 is an abundant number, since it is smaller than the sum of its proper divisors (40907488100256).

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

20421650531232 is a wasteful number, since it uses less digits than its factorization.

20421650531232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37144443 (or 37144432 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 20421650531232 in words is "twenty trillion, four hundred twenty-one billion, six hundred fifty million, five hundred thirty-one thousand, two hundred thirty-two".