20207145 has 32 divisors (see below), whose sum is σ = 37158912. Its totient is φ = 9185472.

The previous prime is 20207129. The next prime is 20207147. The reversal of 20207145 is 54170202.

It is not a de Polignac number, because 20207145 - 2⁴ = 20207129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20207147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22984 + ... + 23846.

It is an arithmetic number, because the mean of its divisors is an integer number (1161216).

Almost surely, 2^20207145 is an apocalyptic number.

It is an amenable number.

20207145 is a deficient number, since it is larger than the sum of its proper divisors (16951767).

20207145 is a wasteful number, since it uses less digits than its factorization.

20207145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 20207145 is about 4495.2358113897. The cubic root of 20207145 is about 272.3756748468.

Adding to 20207145 its reverse (54170202), we get a palindrome (74377347).

The spelling of 20207145 in words is "twenty million, two hundred seven thousand, one hundred forty-five".