20606165280 has 144 divisors (see below), whose sum is σ = 71309294784. Its totient is φ = 5417556480.

The previous prime is 20606165243. The next prime is 20606165291. The reversal of 20606165280 is 8256160602.

20606165280 is a `hidden beast` number, since 20 + 606 + 1 + 6 + 5 + 28 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×20606165280² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1467 + ... + 203013.

It is an arithmetic number, because the mean of its divisors is an integer number (495203436).

Almost surely, 2^20606165280 is an apocalyptic number.

20606165280 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 20606165280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35654647392).

20606165280 is an abundant number, since it is smaller than the sum of its proper divisors (50703129504).

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

20606165280 is a wasteful number, since it uses less digits than its factorization.

20606165280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201639 (or 201628 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 20606165280 in words is "twenty billion, six hundred six million, one hundred sixty-five thousand, two hundred eighty".