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20449819 = 1313911317
BaseRepresentation
bin100111000000…
…0101000011011
31102110221212201
41032000220123
520213343234
62010151031
7335551315
oct116005033
942427781
1020449819
11105a8285
126a22477
1343100b0
142a047b5
151bde314
hex1380a1b

20449819 has 8 divisors (see below), whose sum is σ = 22183280. Its totient is φ = 18739296.

The previous prime is 20449787. The next prime is 20449873. The reversal of 20449819 is 91894402.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20449819 - 25 = 20449787 is a prime.

It is a super-2 number, since 2×204498192 = 836390194265522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20449879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3852 + ... + 7465.

It is an arithmetic number, because the mean of its divisors is an integer number (2772910).

Almost surely, 220449819 is an apocalyptic number.

20449819 is a deficient number, since it is larger than the sum of its proper divisors (1733461).

20449819 is a wasteful number, since it uses less digits than its factorization.

20449819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11469.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 20449819 is about 4522.1476092671. The cubic root of 20449819 is about 273.4616875192.

The spelling of 20449819 in words is "twenty million, four hundred forty-nine thousand, eight hundred nineteen".

Divisors: 1 13 139 1807 11317 147121 1573063 20449819