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18676980 = 22375761
BaseRepresentation
bin100011100111…
…1110011110100
31022010220000000
41013033303310
514240130410
61504151300
7314515560
oct107176364
938126000
1018676980
11a5a7323
126308530
133b3c18a
1426a26a0
15198ddc0
hex11cfcf4

18676980 has 192 divisors, whose sum is σ = 68328960. Its totient is φ = 4199040.

The previous prime is 18676967. The next prime is 18676991. The reversal of 18676980 is 8967681.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 306150 + ... + 306210.

It is an arithmetic number, because the mean of its divisors is an integer number (355880).

Almost surely, 218676980 is an apocalyptic number.

18676980 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 18676980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34164480).

18676980 is an abundant number, since it is smaller than the sum of its proper divisors (49651980).

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

18676980 is an equidigital number, since it uses as much as digits as its factorization.

18676980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 18676980 is about 4321.6871705388. The cubic root of 18676980 is about 265.3193255121.

The spelling of 18676980 in words is "eighteen million, six hundred seventy-six thousand, nine hundred eighty".