20467971840 has 72 divisors (see below), whose sum is σ = 65369597328. Its totient is φ = 5458124800.

The previous prime is 20467971809. The next prime is 20467971847. The reversal of 20467971840 is 4817976402.

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 20467971840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20467971847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2661261 + ... + 2668940.

It is an arithmetic number, because the mean of its divisors is an integer number (907911074).

Almost surely, 2^20467971840 is an apocalyptic number.

20467971840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20467971840 is an abundant number, since it is smaller than the sum of its proper divisors (44901625488).

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

20467971840 is an equidigital number, since it uses as much as digits as its factorization.

20467971840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330225 (or 5330211 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 48.

The spelling of 20467971840 in words is "twenty billion, four hundred sixty-seven million, nine hundred seventy-one thousand, eight hundred forty".