20631000080 has 80 divisors (see below), whose sum is σ = 50841924480. Its totient is φ = 7758821376.

The previous prime is 20631000073. The next prime is 20631000083. The reversal of 20631000080 is 8000013602.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (20631000083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1378397 + ... + 1393283.

It is an arithmetic number, because the mean of its divisors is an integer number (635524056).

Almost surely, 2^20631000080 is an apocalyptic number.

20631000080 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 20631000080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25420962240).

20631000080 is an abundant number, since it is smaller than the sum of its proper divisors (30210924400).

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

20631000080 is a wasteful number, since it uses less digits than its factorization.

20631000080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15936 (or 15930 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 20631000080 its reverse (8000013602), we get a palindrome (28631013682).

The spelling of 20631000080 in words is "twenty billion, six hundred thirty-one million, eighty", and thus it is an aban number.