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20030431 = 37541363
BaseRepresentation
bin100110001101…
…0001111011111
31101200122120211
41030122033133
520111433211
61553153251
7332153521
oct114321737
941618524
1020030431
1110341183
12685b827
1341c4235
142935a11
151b59e21
hex131a3df

20030431 has 4 divisors (see below), whose sum is σ = 20571832. Its totient is φ = 19489032.

The previous prime is 20030411. The next prime is 20030443. The reversal of 20030431 is 13403002.

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

It is a cyclic number.

It is not a de Polignac number, because 20030431 - 213 = 20022239 is a prime.

It is a super-2 number, since 2×200304312 = 802436332091522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20030411) 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, 270645 + ... + 270718.

It is an arithmetic number, because the mean of its divisors is an integer number (5142958).

Almost surely, 220030431 is an apocalyptic number.

20030431 is a deficient number, since it is larger than the sum of its proper divisors (541401).

20030431 is an equidigital number, since it uses as much as digits as its factorization.

20030431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541400.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 20030431 is about 4475.5369510261. The cubic root of 20030431 is about 271.5793626316.

Adding to 20030431 its reverse (13403002), we get a palindrome (33433433).

The spelling of 20030431 in words is "twenty million, thirty thousand, four hundred thirty-one".

Divisors: 1 37 541363 20030431