20420311 has 2 divisors, whose sum is σ = 20420312. Its totient is φ = 20420310.

The previous prime is 20420303. The next prime is 20420329. The reversal of 20420311 is 11302402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20420311 - 2³ = 20420303 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20420291 and 20420300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20420371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10210155 + 10210156.

It is an arithmetic number, because the mean of its divisors is an integer number (10210156).

Almost surely, 2^20420311 is an apocalyptic number.

20420311 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420311 is an equidigital number, since it uses as much as digits as its factorization.

20420311 is an evil number, because the sum of its binary digits is even.

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

The square root of 20420311 is about 4518.8838223614. The cubic root of 20420311 is about 273.3300939863.

Adding to 20420311 its reverse (11302402), we get a palindrome (31722713).

The spelling of 20420311 in words is "twenty million, four hundred twenty thousand, three hundred eleven".