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20405335345 = 54081067069
BaseRepresentation
bin10011000000010000…
…001011010100110001
31221200002020102210221
4103000100023110301
5313242231212340
613212445053041
71321443326413
oct230020132461
957602212727
1020405335345
11872130950a
123b55857181
131c02666835
14db80789b3
157e663544a
hex4c040b531

20405335345 has 4 divisors (see below), whose sum is σ = 24486402420. Its totient is φ = 16324268272.

The previous prime is 20405335303. The next prime is 20405335351. The reversal of 20405335345 is 54353350402.

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 12821712289 + 7583623056 = 113233^2 + 87084^2 .

It is a cyclic number.

It is not a de Polignac number, because 20405335345 - 27 = 20405335217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20405335345.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2040533530 + ... + 2040533539.

It is an arithmetic number, because the mean of its divisors is an integer number (6121600605).

Almost surely, 220405335345 is an apocalyptic number.

It is an amenable number.

20405335345 is a deficient number, since it is larger than the sum of its proper divisors (4081067075).

20405335345 is an equidigital number, since it uses as much as digits as its factorization.

20405335345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4081067074.

The product of its (nonzero) digits is 108000, while the sum is 34.

Adding to 20405335345 its reverse (54353350402), we get a palindrome (74758685747).

The spelling of 20405335345 in words is "twenty billion, four hundred five million, three hundred thirty-five thousand, three hundred forty-five".

Divisors: 1 5 4081067069 20405335345