20173465620 has 216 divisors, whose sum is σ = 77655116448. Its totient is φ = 4191868800.

The previous prime is 20173465619. The next prime is 20173465621. The reversal of 20173465620 is 2656437102.

20173465620 is a `hidden beast` number, since 2 + 0 + 173 + 465 + 6 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (20173465619) and next prime (20173465621).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20173465621) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6946 + ... + 200985.

It is an arithmetic number, because the mean of its divisors is an integer number (359514428).

Almost surely, 2^20173465620 is an apocalyptic number.

20173465620 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 20173465620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38827558224).

20173465620 is an abundant number, since it is smaller than the sum of its proper divisors (57481650828).

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

20173465620 is a wasteful number, since it uses less digits than its factorization.

20173465620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207971 (or 207959 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The spelling of 20173465620 in words is "twenty billion, one hundred seventy-three million, four hundred sixty-five thousand, six hundred twenty".