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20145993 = 37959333
BaseRepresentation
bin100110011011…
…0011101001001
31101220112002220
41030312131021
520124132433
61555444253
7333144450
oct114663511
941815086
1020145993
111040aa8a
1268b6689
134234a0a
142965b97
151b7e2b3
hex1336749

20145993 has 8 divisors (see below), whose sum is σ = 30698688. Its totient is φ = 11511984.

The previous prime is 20145991. The next prime is 20145997. The reversal of 20145993 is 39954102.

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

It is not a de Polignac number, because 20145993 - 21 = 20145991 is a prime.

It is a super-2 number, since 2×201459932 = 811722067912098, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20145991) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 479646 + ... + 479687.

It is an arithmetic number, because the mean of its divisors is an integer number (3837336).

Almost surely, 220145993 is an apocalyptic number.

It is an amenable number.

20145993 is a deficient number, since it is larger than the sum of its proper divisors (10552695).

20145993 is an equidigital number, since it uses as much as digits as its factorization.

20145993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959343.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 20145993 is about 4488.4287896769. The cubic root of 20145993 is about 272.1006376810.

The spelling of 20145993 in words is "twenty million, one hundred forty-five thousand, nine hundred ninety-three".

Divisors: 1 3 7 21 959333 2877999 6715331 20145993