20121573 has 24 divisors (see below), whose sum is σ = 29021440. Its totient is φ = 12386880.

The previous prime is 20121559. The next prime is 20121581. The reversal of 20121573 is 37512102.

It is not a de Polignac number, because 20121573 - 2⁹ = 20121061 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 (20121533) 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 23 ways as a sum of consecutive naturals, for example, 48993 + ... + 49401.

Almost surely, 2^20121573 is an apocalyptic number.

20121573 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20121573 is a deficient number, since it is larger than the sum of its proper divisors (8899867).

20121573 is a wasteful number, since it uses less digits than its factorization.

20121573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 466 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 20121573 is about 4485.7076364828. The cubic root of 20121573 is about 271.9906508104.

Adding to 20121573 its reverse (37512102), we get a palindrome (57633675).

The spelling of 20121573 in words is "twenty million, one hundred twenty-one thousand, five hundred seventy-three".