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20320421 = 113315581
BaseRepresentation
bin100110110000…
…1000010100101
31102020101101012
41031201002211
520200223141
62003312005
7334502132
oct115410245
942211335
1020320421
111051a040
12697b605
134296224
1429ad589
151bb5ceb
hex13610a5

20320421 has 8 divisors (see below), whose sum is σ = 22238688. Its totient is φ = 18414000.

The previous prime is 20320409. The next prime is 20320427. The reversal of 20320421 is 12402302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2k-20320421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20320396 and 20320405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 851 + ... + 6431.

It is an arithmetic number, because the mean of its divisors is an integer number (2779836).

Almost surely, 220320421 is an apocalyptic number.

It is an amenable number.

20320421 is a deficient number, since it is larger than the sum of its proper divisors (1918267).

20320421 is a wasteful number, since it uses less digits than its factorization.

20320421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5923.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20320421 is about 4507.8177647283. The cubic root of 20320421 is about 272.8836825070.

Adding to 20320421 its reverse (12402302), we get a palindrome (32722723).

The spelling of 20320421 in words is "twenty million, three hundred twenty thousand, four hundred twenty-one".

Divisors: 1 11 331 3641 5581 61391 1847311 20320421