420808531 has 64 divisors (see below), whose sum is σ = 557383680. Its totient is φ = 311592960.

The previous prime is 420808489. The next prime is 420808541. The reversal of 420808531 is 135808024.

It is a cyclic number.

It is not a de Polignac number, because 420808531 - 2⁷ = 420808403 is a prime.

It is a super-2 number, since 2×420808531² = 354159639524755922, 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 = 420808493 and 420808502.

It is not an unprimeable number, because it can be changed into a prime (420808541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3313390 + ... + 3313516.

It is an arithmetic number, because the mean of its divisors is an integer number (8709120).

Almost surely, 2^420808531 is an apocalyptic number.

420808531 is a deficient number, since it is larger than the sum of its proper divisors (136575149).

420808531 is a wasteful number, since it uses less digits than its factorization.

420808531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 420808531 is about 20513.6181840259. The cubic root of 420808531 is about 749.3674850868.

The spelling of 420808531 in words is "four hundred twenty million, eight hundred eight thousand, five hundred thirty-one".