20023011 has 8 divisors (see below), whose sum is σ = 29663760. Its totient is φ = 13348656.

The previous prime is 20023009. The next prime is 20023027. The reversal of 20023011 is 11032002.

It is a happy number.

It is not a de Polignac number, because 20023011 - 2¹ = 20023009 is a prime.

It is a super-2 number, since 2×20023011² = 801841939012242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20022984 and 20023002.

It is not an unprimeable number, because it can be changed into a prime (20023001) 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, 370770 + ... + 370823.

It is an arithmetic number, because the mean of its divisors is an integer number (3707970).

Almost surely, 2^20023011 is an apocalyptic number.

20023011 is a deficient number, since it is larger than the sum of its proper divisors (9640749).

20023011 is an equidigital number, since it uses as much as digits as its factorization.

20023011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741602 (or 741596 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 20023011 is about 4474.7079234292. The cubic root of 20023011 is about 271.5458241996.

Adding to 20023011 its reverse (11032002), we get a palindrome (31055013).

The spelling of 20023011 in words is "twenty million, twenty-three thousand, eleven".