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20858708331 = 331745443809
BaseRepresentation
bin10011011011010001…
…101010000101101011
31222211200100011122000
4103123101222011223
5320204312131311
613325442302043
71335620044506
oct233321520553
958750304560
1020858708331
11893421932a
124061657923
131c75574886
14101c37413d
1582133d056
hex4db46a16b

20858708331 has 16 divisors (see below), whose sum is σ = 32719543200. Its totient is φ = 13087816704.

The previous prime is 20858708323. The next prime is 20858708333. The reversal of 20858708331 is 13380785802.

It is not a de Polignac number, because 20858708331 - 23 = 20858708323 is a prime.

It is a super-2 number, since 2×208587083312 (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20858708333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22721446 + ... + 22722363.

It is an arithmetic number, because the mean of its divisors is an integer number (2044971450).

Almost surely, 220858708331 is an apocalyptic number.

20858708331 is a deficient number, since it is larger than the sum of its proper divisors (11860834869).

20858708331 is a wasteful number, since it uses less digits than its factorization.

20858708331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45443835 (or 45443829 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 20858708331 in words is "twenty billion, eight hundred fifty-eight million, seven hundred eight thousand, three hundred thirty-one".

Divisors: 1 3 9 17 27 51 153 459 45443809 136331427 408994281 772544753 1226982843 2317634259 6952902777 20858708331