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20613606518 = 210306803259
BaseRepresentation
bin10011001100101010…
…101010110001110110
31222012121010201011002
4103030222222301312
5314204040402033
613245245043302
71326552523121
oct231452526166
958177121132
1020613606518
11881893074a
123bb3556532
131c3685880b
14dd79b13b8
15809a753e8
hex4ccaaac76

20613606518 has 4 divisors (see below), whose sum is σ = 30920409780. Its totient is φ = 10306803258.

The previous prime is 20613606511. The next prime is 20613606529. The reversal of 20613606518 is 81560631602.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20613606511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5153401628 + ... + 5153401631.

It is an arithmetic number, because the mean of its divisors is an integer number (7730102445).

Almost surely, 220613606518 is an apocalyptic number.

20613606518 is a deficient number, since it is larger than the sum of its proper divisors (10306803262).

20613606518 is a wasteful number, since it uses less digits than its factorization.

20613606518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10306803261.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 20613606518 in words is "twenty billion, six hundred thirteen million, six hundred six thousand, five hundred eighteen".

Divisors: 1 2 10306803259 20613606518