20171480 has 64 divisors (see below), whose sum is σ = 52764480. Its totient is φ = 6796800.

The previous prime is 20171477. The next prime is 20171491. The reversal of 20171480 is 8417102.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 16490 + ... + 17670.

It is an arithmetic number, because the mean of its divisors is an integer number (824445).

Almost surely, 2^20171480 is an apocalyptic number.

20171480 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 20171480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26382240).

20171480 is an abundant number, since it is smaller than the sum of its proper divisors (32593000).

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

20171480 is a wasteful number, since it uses less digits than its factorization.

20171480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260 (or 1256 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 20171480 is about 4491.2670817933. The cubic root of 20171480 is about 272.2153355347.

Adding to 20171480 its reverse (8417102), we get a palindrome (28588582).

It can be divided in two parts, 201 and 71480, that multiplied together give a triangular number (14367480 = T₅₃₆₀).

The spelling of 20171480 in words is "twenty million, one hundred seventy-one thousand, four hundred eighty".