420567731 has 4 divisors (see below), whose sum is σ = 434134464. Its totient is φ = 407001000.

The previous prime is 420567727. The next prime is 420567751. The reversal of 420567731 is 137765024.

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 420567731 - 2² = 420567727 is a prime.

It is a super-2 number, since 2×420567731² = 353754432716976722, 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 = 420567691 and 420567700.

It is not an unprimeable number, because it can be changed into a prime (420567751) 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, 6783320 + ... + 6783381.

It is an arithmetic number, because the mean of its divisors is an integer number (108533616).

Almost surely, 2^420567731 is an apocalyptic number.

420567731 is a deficient number, since it is larger than the sum of its proper divisors (13566733).

420567731 is a wasteful number, since it uses less digits than its factorization.

420567731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13566732.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 420567731 is about 20507.7480723750. The cubic root of 420567731 is about 749.2245205259.

The spelling of 420567731 in words is "four hundred twenty million, five hundred sixty-seven thousand, seven hundred thirty-one".