20820763 has 2 divisors, whose sum is σ = 20820764. Its totient is φ = 20820762.

The previous prime is 20820757. The next prime is 20820769. The reversal of 20820763 is 36702802.

It is a balanced prime because it is at equal distance from previous prime (20820757) and next prime (20820769).

It is a cyclic number.

It is not a de Polignac number, because 20820763 - 2⁵ = 20820731 is a prime.

It is equal to p_1319329 and since 20820763 and 1319329 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20820769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10410381 + 10410382.

It is an arithmetic number, because the mean of its divisors is an integer number (10410382).

Almost surely, 2^20820763 is an apocalyptic number.

20820763 is a deficient number, since it is larger than the sum of its proper divisors (1).

20820763 is an equidigital number, since it uses as much as digits as its factorization.

20820763 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20820763 is about 4562.9774270754. The cubic root of 20820763 is about 275.1052511720.

The spelling of 20820763 in words is "twenty million, eight hundred twenty thousand, seven hundred sixty-three".