220187406 has 8 divisors (see below), whose sum is σ = 440374824. Its totient is φ = 73395800.

The previous prime is 220187377. The next prime is 220187419. The reversal of 220187406 is 604781022.

It is a sphenic number, since it is the product of 3 distinct primes.

220187406 is an admirable number.

It is a super-2 number, since 2×220187406² = 96964987522017672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18348945 + ... + 18348956.

It is an arithmetic number, because the mean of its divisors is an integer number (55046853).

Almost surely, 2^220187406 is an apocalyptic number.

220187406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

220187406 is a wasteful number, since it uses less digits than its factorization.

220187406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36697906.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 220187406 is about 14838.7130843615. The cubic root of 220187406 is about 603.8524393562.

The spelling of 220187406 in words is "two hundred twenty million, one hundred eighty-seven thousand, four hundred six".