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20606560 = 255139907
BaseRepresentation
bin100111010011…
…0111001100000
31102202220212221
41032212321200
520233402220
62013400424
7340103302
oct116467140
942686787
1020606560
11106a5017
126a99114
134366540
142a45972
151c209aa
hex13a6e60

20606560 has 48 divisors (see below), whose sum is σ = 52433136. Its totient is φ = 7607808.

The previous prime is 20606557. The next prime is 20606563. The reversal of 20606560 is 6560602.

It is an interprime number because it is at equal distance from previous prime (20606557) and next prime (20606563).

It is a super-5 number, since 5×206065605 (a number of 38 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20606563) 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, 2874 + ... + 7033.

It is an arithmetic number, because the mean of its divisors is an integer number (1092357).

Almost surely, 220606560 is an apocalyptic number.

20606560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20606560 is an abundant number, since it is smaller than the sum of its proper divisors (31826576).

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

20606560 is a wasteful number, since it uses less digits than its factorization.

20606560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9935 (or 9927 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20606560 is about 4539.4448999850. Note that the first 3 decimals coincide. The cubic root of 20606560 is about 274.1585740947.

The spelling of 20606560 in words is "twenty million, six hundred six thousand, five hundred sixty".