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20303021 = 591931783
BaseRepresentation
bin100110101110…
…0110010101101
31102012111111202
41031130302231
520144144041
62003055245
7334400324
oct115346255
942174452
1020303021
1110507a62
126971525
13428b32b
1429a70bb
151bb0a9b
hex135ccad

20303021 has 8 divisors (see below), whose sum is σ = 20765760. Its totient is φ = 19844352.

The previous prime is 20303011. The next prime is 20303027. The reversal of 20303021 is 12030302.

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

It is a cyclic number.

It is not a de Polignac number, because 20303021 - 26 = 20302957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20302993 and 20303011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303027) 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, 10496 + ... + 12278.

It is an arithmetic number, because the mean of its divisors is an integer number (2595720).

Almost surely, 220303021 is an apocalyptic number.

It is an amenable number.

20303021 is a deficient number, since it is larger than the sum of its proper divisors (462739).

20303021 is a wasteful number, since it uses less digits than its factorization.

20303021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2035.

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 20303021 is about 4505.8873709848. The cubic root of 20303021 is about 272.8057718512.

Adding to 20303021 its reverse (12030302), we get a palindrome (32333323).

The spelling of 20303021 in words is "twenty million, three hundred three thousand, twenty-one".

Divisors: 1 59 193 1783 11387 105197 344119 20303021