20108726640 has 120 divisors (see below), whose sum is σ = 67736633328. Its totient is φ = 5346063360.

The previous prime is 20108726633. The next prime is 20108726647. The reversal of 20108726640 is 4662780102.

20108726640 is a `hidden beast` number, since 2 + 0 + 1 + 0 + 8 + 7 + 2 + 6 + 640 = 666.

It is an interprime number because it is at equal distance from previous prime (20108726633) and next prime (20108726647).

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20108726595 and 20108726604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20108726647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196132 + ... + 280508.

Almost surely, 2^20108726640 is an apocalyptic number.

20108726640 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 20108726640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33868316664).

20108726640 is an abundant number, since it is smaller than the sum of its proper divisors (47627906688).

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

20108726640 is a wasteful number, since it uses less digits than its factorization.

20108726640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84727 (or 84718 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 20108726640 in words is "twenty billion, one hundred eight million, seven hundred twenty-six thousand, six hundred forty".