420205693 has 2 divisors, whose sum is σ = 420205694. Its totient is φ = 420205692.

The previous prime is 420205663. The next prime is 420205703. The reversal of 420205693 is 396502024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 406344964 + 13860729 = 20158^2 + 3723^2 .

It is a cyclic number.

It is not a de Polignac number, because 420205693 - 2²¹ = 418108541 is a prime.

It is a super-2 number, since 2×420205693² = 353145648859220498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420205603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210102846 + 210102847.

It is an arithmetic number, because the mean of its divisors is an integer number (210102847).

Almost surely, 2^420205693 is an apocalyptic number.

It is an amenable number.

420205693 is a deficient number, since it is larger than the sum of its proper divisors (1).

420205693 is an equidigital number, since it uses as much as digits as its factorization.

420205693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 420205693 is about 20498.9193129784. The cubic root of 420205693 is about 749.0094734224.

The spelling of 420205693 in words is "four hundred twenty million, two hundred five thousand, six hundred ninety-three".