420320691 has 64 divisors (see below), whose sum is σ = 729308160. Its totient is φ = 234316800.

The previous prime is 420320647. The next prime is 420320701. The reversal of 420320691 is 196023024.

It is not a de Polignac number, because 420320691 - 2¹¹ = 420318643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (420328691) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1851520 + ... + 1851746.

It is an arithmetic number, because the mean of its divisors is an integer number (11395440).

Almost surely, 2^420320691 is an apocalyptic number.

420320691 is a deficient number, since it is larger than the sum of its proper divisors (308987469).

420320691 is a wasteful number, since it uses less digits than its factorization.

420320691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441 (or 435 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 420320691 is about 20501.7240982313. The cubic root of 420320691 is about 749.0777945142.

The spelling of 420320691 in words is "four hundred twenty million, three hundred twenty thousand, six hundred ninety-one".