20531739480 has 128 divisors (see below), whose sum is σ = 70949191680. Its totient is φ = 4655992320.

The previous prime is 20531739463. The next prime is 20531739517. The reversal of 20531739480 is 8493713502.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 31 ways as a sum of consecutive naturals, for example, 10450 + ... + 202910.

It is an arithmetic number, because the mean of its divisors is an integer number (554290560).

Almost surely, 2^20531739480 is an apocalyptic number.

20531739480 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 20531739480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35474595840).

20531739480 is an abundant number, since it is smaller than the sum of its proper divisors (50417452200).

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

20531739480 is a wasteful number, since it uses less digits than its factorization.

20531739480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192609 (or 192605 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 20531739480 in words is "twenty billion, five hundred thirty-one million, seven hundred thirty-nine thousand, four hundred eighty".