20404535456 has 48 divisors (see below), whose sum is σ = 40997728800. Its totient is φ = 9993646848.

The previous prime is 20404535429. The next prime is 20404535497. The reversal of 20404535456 is 65453540402.

It is a super-2 number, since 2×20404535456² (a number of 21 digits) contains 22 as substring.

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, 515210 + ... + 553398.

It is an arithmetic number, because the mean of its divisors is an integer number (854119350).

Almost surely, 2^20404535456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20404535456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20498864400).

20404535456 is an abundant number, since it is smaller than the sum of its proper divisors (20593193344).

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

20404535456 is a wasteful number, since it uses less digits than its factorization.

20404535456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38541 (or 38533 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 38.

The spelling of 20404535456 in words is "twenty billion, four hundred four million, five hundred thirty-five thousand, four hundred fifty-six".