20420377 has 2 divisors, whose sum is σ = 20420378. Its totient is φ = 20420376.

The previous prime is 20420371. The next prime is 20420443. The reversal of 20420377 is 77302402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11723776 + 8696601 = 3424^2 + 2949^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20420377 is a prime.

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, 10210188 + 10210189.

It is an arithmetic number, because the mean of its divisors is an integer number (10210189).

Almost surely, 2^20420377 is an apocalyptic number.

It is an amenable number.

20420377 is a deficient number, since it is larger than the sum of its proper divisors (1).

20420377 is an equidigital number, since it uses as much as digits as its factorization.

20420377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 25.

The square root of 20420377 is about 4518.8911250438. The cubic root of 20420377 is about 273.3303884606.

Adding to 20420377 its reverse (77302402), we get a palindrome (97722779).

The spelling of 20420377 in words is "twenty million, four hundred twenty thousand, three hundred seventy-seven".