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20661666 = 2314712341
BaseRepresentation
bin100111011010…
…0010110100010
31102212201110220
41032310112202
520242133131
62014503510
7340423044
oct116642642
942781426
1020661666
1110732463
126b04b96
13438564c
142a5ba94
151c31e96
hex13b45a2

20661666 has 16 divisors (see below), whose sum is σ = 41369088. Its totient is φ = 6879600.

The previous prime is 20661643. The next prime is 20661689. The reversal of 20661666 is 66616602.

It is an interprime number because it is at equal distance from previous prime (20661643) and next prime (20661689).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7656 + ... + 9996.

It is an arithmetic number, because the mean of its divisors is an integer number (2585568).

Almost surely, 220661666 is an apocalyptic number.

20661666 is an abundant number, since it is smaller than the sum of its proper divisors (20707422).

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

20661666 is a wasteful number, since it uses less digits than its factorization.

20661666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3817.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 20661666 is about 4545.5105323825. The cubic root of 20661666 is about 274.4027412482.

The spelling of 20661666 in words is "twenty million, six hundred sixty-one thousand, six hundred sixty-six".

Divisors: 1 2 3 6 1471 2341 2942 4413 4682 7023 8826 14046 3443611 6887222 10330833 20661666