20665567020 has 192 divisors, whose sum is σ = 68267308032. Its totient is φ = 4572672000.

The previous prime is 20665567009. The next prime is 20665567031. The reversal of 20665567020 is 2076556602.

It is an interprime number because it is at equal distance from previous prime (20665567009) and next prime (20665567031).

It is a super-2 number, since 2×20665567020² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20665567020.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2251240 + ... + 2260400.

It is an arithmetic number, because the mean of its divisors is an integer number (355558896).

Almost surely, 2^20665567020 is an apocalyptic number.

20665567020 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 20665567020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34133654016).

20665567020 is an abundant number, since it is smaller than the sum of its proper divisors (47601741012).

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

20665567020 is a wasteful number, since it uses less digits than its factorization.

20665567020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9352 (or 9350 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 39.

The spelling of 20665567020 in words is "twenty billion, six hundred sixty-five million, five hundred sixty-seven thousand, twenty".