20476467840 has 128 divisors (see below), whose sum is σ = 65847038400. Its totient is φ = 5412012032.

The previous prime is 20476467833. The next prime is 20476467857. The reversal of 20476467840 is 4876467402.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 20476467840.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169771 + ... + 264149.

Almost surely, 2^20476467840 is an apocalyptic number.

20476467840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20476467840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32923519200).

20476467840 is an abundant number, since it is smaller than the sum of its proper divisors (45370570560).

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

20476467840 is a wasteful number, since it uses less digits than its factorization.

20476467840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94514 (or 94502 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 48.

The spelling of 20476467840 in words is "twenty billion, four hundred seventy-six million, four hundred sixty-seven thousand, eight hundred forty".