220136940 has 60 divisors (see below), whose sum is σ = 690582816. Its totient is φ = 58702752.

The previous prime is 220136929. The next prime is 220136947. The reversal of 220136940 is 49631022.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (220136947) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 66324 + ... + 69563.

Almost surely, 2^220136940 is an apocalyptic number.

220136940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220136940 is an abundant number, since it is smaller than the sum of its proper divisors (470445876).

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

220136940 is a wasteful number, since it uses less digits than its factorization.

220136940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135908 (or 135897 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 220136940 is about 14837.0125025222. The cubic root of 220136940 is about 603.8063023764.

Adding to 220136940 its reverse (49631022), we get a palindrome (269767962).

The spelling of 220136940 in words is "two hundred twenty million, one hundred thirty-six thousand, nine hundred forty".