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20091983 = 294714741
BaseRepresentation
bin100110010100…
…1010001001111
31101210210000112
41030221101033
520120420413
61554350235
7332531132
oct114512117
941723015
1020091983
111038344a
12688b37b
134216262
142950219
151b6d2a8
hex132944f

20091983 has 8 divisors (see below), whose sum is σ = 21228480. Its totient is φ = 18985120.

The previous prime is 20091971. The next prime is 20091989. The reversal of 20091983 is 38919002.

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 20091983 - 214 = 20075599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20091989) 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, 6008 + ... + 8733.

It is an arithmetic number, because the mean of its divisors is an integer number (2653560).

Almost surely, 220091983 is an apocalyptic number.

20091983 is a deficient number, since it is larger than the sum of its proper divisors (1136497).

20091983 is a wasteful number, since it uses less digits than its factorization.

20091983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14817.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 20091983 is about 4482.4081697231. The cubic root of 20091983 is about 271.8572591233.

The spelling of 20091983 in words is "twenty million, ninety-one thousand, nine hundred eighty-three".

Divisors: 1 29 47 1363 14741 427489 692827 20091983