6720420431 has 4 divisors (see below), whose sum is σ = 6739677000. Its totient is φ = 6701163864.

The previous prime is 6720420419. The next prime is 6720420437. The reversal of 6720420431 is 1340240276.

6720420431 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6720420431 - 2¹⁸ = 6720158287 is a prime.

It is a super-2 number, since 2×6720420431² = 90328101538804451522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6720420394 and 6720420403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6720420437) 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, 9627761 + ... + 9628458.

It is an arithmetic number, because the mean of its divisors is an integer number (1684919250).

Almost surely, 2^6720420431 is an apocalyptic number.

6720420431 is a deficient number, since it is larger than the sum of its proper divisors (19256569).

6720420431 is a wasteful number, since it uses less digits than its factorization.

6720420431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19256568.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 6720420431 is about 81978.1704540910. The cubic root of 6720420431 is about 1887.1169457662.

The spelling of 6720420431 in words is "six billion, seven hundred twenty million, four hundred twenty thousand, four hundred thirty-one".