20212545 has 32 divisors (see below), whose sum is σ = 33707520. Its totient is φ = 10333440.

The previous prime is 20212531. The next prime is 20212547. The reversal of 20212545 is 54521202.

It is a happy number.

It is not a de Polignac number, because 20212545 - 2⁴ = 20212529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20212547) 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, 43615 + ... + 44075.

It is an arithmetic number, because the mean of its divisors is an integer number (1053360).

Almost surely, 2^20212545 is an apocalyptic number.

It is an amenable number.

20212545 is a deficient number, since it is larger than the sum of its proper divisors (13494975).

20212545 is a wasteful number, since it uses less digits than its factorization.

20212545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 20212545 is about 4495.8364071661. The cubic root of 20212545 is about 272.3999352037.

Adding to 20212545 its reverse (54521202), we get a palindrome (74733747).

The spelling of 20212545 in words is "twenty million, two hundred twelve thousand, five hundred forty-five".