20121413 has 8 divisors (see below), whose sum is σ = 21716856. Its totient is φ = 18532800.

The previous prime is 20121401. The next prime is 20121427. The reversal of 20121413 is 31412102.

It can be written as a sum of positive squares in 4 ways, for example, as 611524 + 19509889 = 782^2 + 4417^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20121413 - 2⁶ = 20121349 is a prime.

It is a super-2 number, since 2×20121413² = 809742522233138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121433) 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 7 ways as a sum of consecutive naturals, for example, 5603 + ... + 8463.

It is an arithmetic number, because the mean of its divisors is an integer number (2714607).

Almost surely, 2^20121413 is an apocalyptic number.

It is an amenable number.

20121413 is a deficient number, since it is larger than the sum of its proper divisors (1595443).

20121413 is a wasteful number, since it uses less digits than its factorization.

20121413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3415.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 20121413 is about 4485.6898020260. The cubic root of 20121413 is about 271.9899298824.

Adding to 20121413 its reverse (31412102), we get a palindrome (51533515).

The spelling of 20121413 in words is "twenty million, one hundred twenty-one thousand, four hundred thirteen".