20174220 has 144 divisors (see below), whose sum is σ = 69818112. Its totient is φ = 4667520.

The previous prime is 20174191. The next prime is 20174237. The reversal of 20174220 is 2247102.

It is a super-3 number, since 3×20174220³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20174193 and 20174202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 45319 + ... + 45761.

It is an arithmetic number, because the mean of its divisors is an integer number (484848).

Almost surely, 2^20174220 is an apocalyptic number.

20174220 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 20174220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34909056).

20174220 is an abundant number, since it is smaller than the sum of its proper divisors (49643892).

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

20174220 is a wasteful number, since it uses less digits than its factorization.

20174220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492 (or 487 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 20174220 is about 4491.5721078482. The cubic root of 20174220 is about 272.2276604649.

The spelling of 20174220 in words is "twenty million, one hundred seventy-four thousand, two hundred twenty".