163740220 has 96 divisors (see below), whose sum is σ = 413715456. Its totient is φ = 53222400.

The previous prime is 163740217. The next prime is 163740223. The reversal of 163740220 is 22047361.

163740220 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (163740217) and next prime (163740223).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163740223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 679300 + ... + 679540.

It is an arithmetic number, because the mean of its divisors is an integer number (4309536).

Almost surely, 2^163740220 is an apocalyptic number.

163740220 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 163740220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206857728).

163740220 is an abundant number, since it is smaller than the sum of its proper divisors (249975236).

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

163740220 is a wasteful number, since it uses less digits than its factorization.

163740220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 163740220 is about 12796.1017501425. The cubic root of 163740220 is about 547.0811987384.

Adding to 163740220 its reverse (22047361), we get a palindrome (185787581).

The spelling of 163740220 in words is "one hundred sixty-three million, seven hundred forty thousand, two hundred twenty".