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20066634457 = 22818797297
BaseRepresentation
bin10010101100000100…
…001000101011011001
31220210110220122112121
4102230010020223121
5312044024300312
613115105341241
71310161402312
oct225404105331
956713818477
1020066634457
118568101521
123a80337821
131b7a4385cc
14d850ad609
157c6a2e707
hex4ac108ad9

20066634457 has 4 divisors (see below), whose sum is σ = 20075434036. Its totient is φ = 20057834880.

The previous prime is 20066634439. The next prime is 20066634473. The reversal of 20066634457 is 75443666002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16871671881 + 3194962576 = 129891^2 + 56524^2 .

It is a cyclic number.

It is not a de Polignac number, because 20066634457 - 211 = 20066632409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20066634557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4396368 + ... + 4400929.

It is an arithmetic number, because the mean of its divisors is an integer number (5018858509).

Almost surely, 220066634457 is an apocalyptic number.

It is an amenable number.

20066634457 is a deficient number, since it is larger than the sum of its proper divisors (8799579).

20066634457 is an equidigital number, since it uses as much as digits as its factorization.

20066634457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8799578.

The product of its (nonzero) digits is 725760, while the sum is 43.

The spelling of 20066634457 in words is "twenty billion, sixty-six million, six hundred thirty-four thousand, four hundred fifty-seven".

Divisors: 1 2281 8797297 20066634457