20231145 has 48 divisors (see below), whose sum is σ = 39940992. Its totient is φ = 9377280.

The previous prime is 20231137. The next prime is 20231149. The reversal of 20231145 is 54113202.

It is not a de Polignac number, because 20231145 - 2³ = 20231137 is a prime.

It is a super-2 number, since 2×20231145² = 818598456022050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20231149) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10497 + ... + 12273.

It is an arithmetic number, because the mean of its divisors is an integer number (832104).

Almost surely, 2^20231145 is an apocalyptic number.

It is an amenable number.

20231145 is a deficient number, since it is larger than the sum of its proper divisors (19709847).

20231145 is a wasteful number, since it uses less digits than its factorization.

20231145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822 (or 1819 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 20231145 is about 4497.9045121034. The cubic root of 20231145 is about 272.4834655961.

Adding to 20231145 its reverse (54113202), we get a palindrome (74344347).

The spelling of 20231145 in words is "twenty million, two hundred thirty-one thousand, one hundred forty-five".