206420761 has 4 divisors (see below), whose sum is σ = 207996624. Its totient is φ = 204844900.

The previous prime is 206420729. The next prime is 206420771. The reversal of 206420761 is 167024602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 167024602 = 2 ⋅83512301.

It is a cyclic number.

It is not a de Polignac number, because 206420761 - 2⁵ = 206420729 is a prime.

It is a super-3 number, since 3×206420761³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206420771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 787735 + ... + 787996.

It is an arithmetic number, because the mean of its divisors is an integer number (51999156).

Almost surely, 2^206420761 is an apocalyptic number.

It is an amenable number.

206420761 is a deficient number, since it is larger than the sum of its proper divisors (1575863).

206420761 is a wasteful number, since it uses less digits than its factorization.

206420761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575862.

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

The square root of 206420761 is about 14367.3505212339. The cubic root of 206420761 is about 590.9958867598.

The spelling of 206420761 in words is "two hundred six million, four hundred twenty thousand, seven hundred sixty-one".