20717207040 has 80 divisors (see below), whose sum is σ = 66230345808. Its totient is φ = 5524586496.

The previous prime is 20717207009. The next prime is 20717207087. The reversal of 20717207040 is 4070271702.

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 (30).

It is a junction number, because it is equal to n+sod(n) for n = 20717206989 and 20717207007.

It is a congruent number.

It is an unprimeable number.

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, 1341097 + ... + 1356456.

Almost surely, 2^20717207040 is an apocalyptic number.

20717207040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20717207040 is an abundant number, since it is smaller than the sum of its proper divisors (45513138768).

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

20717207040 is an equidigital number, since it uses as much as digits as its factorization.

20717207040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2697579 (or 2697563 counting only the distinct ones).

The product of its (nonzero) digits is 5488, while the sum is 30.

Adding to 20717207040 its reverse (4070271702), we get a palindrome (24787478742).

The spelling of 20717207040 in words is "twenty billion, seven hundred seventeen million, two hundred seven thousand, forty".