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20230021 = 72890003
BaseRepresentation
bin100110100101…
…0111110000101
31102001210101001
41031022332011
520134330041
62001333301
7333644440
oct115127605
942053331
1020230021
1110468129
126937231
134264036
142988657
151b99131
hex134af85

20230021 has 4 divisors (see below), whose sum is σ = 23120032. Its totient is φ = 17340012.

The previous prime is 20229991. The next prime is 20230031. The reversal of 20230021 is 12003202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12003202 = 26001601.

It is a cyclic number.

It is not a de Polignac number, because 20230021 - 27 = 20229893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20230031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1444995 + ... + 1445008.

It is an arithmetic number, because the mean of its divisors is an integer number (5780008).

Almost surely, 220230021 is an apocalyptic number.

It is an amenable number.

20230021 is a deficient number, since it is larger than the sum of its proper divisors (2890011).

20230021 is an equidigital number, since it uses as much as digits as its factorization.

20230021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2890010.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 20230021 is about 4497.7795632956. The cubic root of 20230021 is about 272.4784192993.

Adding to 20230021 its reverse (12003202), we get a palindrome (32233223).

The spelling of 20230021 in words is "twenty million, two hundred thirty thousand, twenty-one".

Divisors: 1 7 2890003 20230021