172220020 has 48 divisors (see below), whose sum is σ = 418336128. Its totient is φ = 58331520.

The previous prime is 172219991. The next prime is 172220033. The reversal of 172220020 is 20022271.

It is a junction number, because it is equal to n+sod(n) for n = 172219976 and 172220003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4210 + ... + 19030.

It is an arithmetic number, because the mean of its divisors is an integer number (8715336).

Almost surely, 2^172220020 is an apocalyptic number.

172220020 is a gapful number since it is divisible by the number (10) 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 172220020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209168064).

172220020 is an abundant number, since it is smaller than the sum of its proper divisors (246116108).

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

172220020 is a wasteful number, since it uses less digits than its factorization.

172220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14920 (or 14918 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 172220020 is about 13123.2625516676. The cubic root of 172220020 is about 556.3668067624.

Adding to 172220020 its reverse (20022271), we get a palindrome (192242291).

The spelling of 172220020 in words is "one hundred seventy-two million, two hundred twenty thousand, twenty".