20820413 has 2 divisors, whose sum is σ = 20820414. Its totient is φ = 20820412.

The previous prime is 20820407. The next prime is 20820419. The reversal of 20820413 is 31402802.

It is a balanced prime because it is at equal distance from previous prime (20820407) and next prime (20820419).

It can be written as a sum of positive squares in only one way, i.e., 12652249 + 8168164 = 3557^2 + 2858^2 .

It is a cyclic number.

It is not a de Polignac number, because 20820413 - 2⁸ = 20820157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20820419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10410206 + 10410207.

It is an arithmetic number, because the mean of its divisors is an integer number (10410207).

Almost surely, 2^20820413 is an apocalyptic number.

It is an amenable number.

20820413 is a deficient number, since it is larger than the sum of its proper divisors (1).

20820413 is an equidigital number, since it uses as much as digits as its factorization.

20820413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 20820413 is about 4562.9390747631. The cubic root of 20820413 is about 275.1037096438.

The spelling of 20820413 in words is "twenty million, eight hundred twenty thousand, four hundred thirteen".