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20619140 = 2251030957
BaseRepresentation
bin100111010100…
…1111110000100
31102210120010212
41032221332010
520234303030
62013534552
7340155053
oct116517604
942716125
1020619140
1110703513
126aa4458
13436c199
142a4a39a
151c24595
hex13a9f84

20619140 has 12 divisors (see below), whose sum is σ = 43300236. Its totient is φ = 8247648.

The previous prime is 20619139. The next prime is 20619163. The reversal of 20619140 is 4191602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 14868736 + 5750404 = 3856^2 + 2398^2 .

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 3 ways as a sum of consecutive naturals, for example, 515459 + ... + 515498.

It is an arithmetic number, because the mean of its divisors is an integer number (3608353).

Almost surely, 220619140 is an apocalyptic number.

20619140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20619140 is an abundant number, since it is smaller than the sum of its proper divisors (22681096).

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

20619140 is a wasteful number, since it uses less digits than its factorization.

20619140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030966 (or 1030964 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 20619140 is about 4540.8303205471. The cubic root of 20619140 is about 274.2143526634.

The spelling of 20619140 in words is "twenty million, six hundred nineteen thousand, one hundred forty".

Divisors: 1 2 4 5 10 20 1030957 2061914 4123828 5154785 10309570 20619140