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20113553 = 53379501
BaseRepresentation
bin100110010111…
…0100010010001
31101211212121102
41030232202101
520122113203
61555034145
7332651045
oct114564221
941755542
1020113553
1110398679
12689b955
134223015
142958025
151b74888
hex132e891

20113553 has 4 divisors (see below), whose sum is σ = 20493108. Its totient is φ = 19734000.

The previous prime is 20113547. The next prime is 20113573. The reversal of 20113553 is 35531102.

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 5121169 + 14992384 = 2263^2 + 3872^2 .

It is a cyclic number.

It is not a de Polignac number, because 20113553 - 24 = 20113537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20113573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189698 + ... + 189803.

It is an arithmetic number, because the mean of its divisors is an integer number (5123277).

Almost surely, 220113553 is an apocalyptic number.

It is an amenable number.

20113553 is a deficient number, since it is larger than the sum of its proper divisors (379555).

20113553 is an equidigital number, since it uses as much as digits as its factorization.

20113553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379554.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 20113553 is about 4484.8135970183. The cubic root of 20113553 is about 271.9545095853.

Adding to 20113553 its reverse (35531102), we get a palindrome (55644655).

The spelling of 20113553 in words is "twenty million, one hundred thirteen thousand, five hundred fifty-three".

Divisors: 1 53 379501 20113553