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20451722258 = 21122923172
BaseRepresentation
bin10011000011000001…
…001000010000010010
31221210022112010200202
4103003001020100102
5313341120103013
613221223215202
71322545525262
oct230301102022
957708463622
1020451722258
118745511700
123b692a7502
131c0c158506
14dc02b17a2
157ea749858
hex4c3048412

20451722258 has 54 divisors (see below), whose sum is σ = 35033355903. Its totient is φ = 8947363040.

The previous prime is 20451722243. The next prime is 20451722261. The reversal of 20451722258 is 85222715402.

It can be written as a sum of positive squares in 5 ways, for example, as 1384807369 + 19066914889 = 37213^2 + 138083^2 .

It is an ABA number since it can be written as A⋅BA, here for A=2, B=101123.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 64516316 + ... + 64516632.

Almost surely, 220451722258 is an apocalyptic number.

20451722258 is a deficient number, since it is larger than the sum of its proper divisors (14581633645).

20451722258 is an equidigital number, since it uses as much as digits as its factorization.

20451722258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 38.

The spelling of 20451722258 in words is "twenty billion, four hundred fifty-one million, seven hundred twenty-two thousand, two hundred fifty-eight".

Divisors: 1 2 11 22 29 58 121 242 317 319 634 638 841 1682 3487 3509 6974 7018 9193 9251 18386 18502 38357 76714 100489 101123 101761 200978 202246 203522 266597 533194 1105379 1112353 2210758 2224706 2914181 2932567 5828362 5865134 12159169 24318338 32055991 32258237 64111982 64516474 84511249 169022498 352615901 705231802 929623739 1859247478 10225861129 20451722258