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20004144551 = 139143914709
BaseRepresentation
bin10010101000010101…
…110000010110100111
31220122010022211111122
4102220111300112213
5311432030111201
613104554124155
71305502265066
oct225025602647
956563284448
1020004144551
1185358aa976
123a6342065b
131b6a4c9231
14d7aa841dd
157c12d8e1b
hex4a85705a7

20004144551 has 4 divisors (see below), whose sum is σ = 20148059400. Its totient is φ = 19860229704.

The previous prime is 20004144539. The next prime is 20004144607. The reversal of 20004144551 is 15544140002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-20004144551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20004144551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004144751) 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, 71957216 + ... + 71957493.

It is an arithmetic number, because the mean of its divisors is an integer number (5037014850).

Almost surely, 220004144551 is an apocalyptic number.

20004144551 is a deficient number, since it is larger than the sum of its proper divisors (143914849).

20004144551 is a wasteful number, since it uses less digits than its factorization.

20004144551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143914848.

The product of its (nonzero) digits is 3200, while the sum is 26.

Adding to 20004144551 its reverse (15544140002), we get a palindrome (35548284553).

The spelling of 20004144551 in words is "twenty billion, four million, one hundred forty-four thousand, five hundred fifty-one".

Divisors: 1 139 143914709 20004144551