20021413 has 2 divisors, whose sum is σ = 20021414. Its totient is φ = 20021412.

The previous prime is 20021411. The next prime is 20021429. The reversal of 20021413 is 31412002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16916769 + 3104644 = 4113^2 + 1762^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021413 - 2¹ = 20021411 is a prime.

Together with 20021411, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20021393 and 20021402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010706 + 10010707.

It is an arithmetic number, because the mean of its divisors is an integer number (10010707).

Almost surely, 2^20021413 is an apocalyptic number.

It is an amenable number.

20021413 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021413 is an equidigital number, since it uses as much as digits as its factorization.

20021413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 20021413 is about 4474.5293607261. The cubic root of 20021413 is about 271.5386001484.

Adding to 20021413 its reverse (31412002), we get a palindrome (51433415).

The spelling of 20021413 in words is "twenty million, twenty-one thousand, four hundred thirteen".