420503557 has 4 divisors (see below), whose sum is σ = 431868556. Its totient is φ = 409138560.

The previous prime is 420503539. The next prime is 420503609. The reversal of 420503557 is 755305024.

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

It can be written as a sum of positive squares in 2 ways, for example, as 245893761 + 174609796 = 15681^2 + 13214^2 .

It is a cyclic number.

It is not a de Polignac number, because 420503557 - 2¹¹ = 420501509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420503507) 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, 5682444 + ... + 5682517.

It is an arithmetic number, because the mean of its divisors is an integer number (107967139).

Almost surely, 2^420503557 is an apocalyptic number.

It is an amenable number.

420503557 is a deficient number, since it is larger than the sum of its proper divisors (11364999).

420503557 is a wasteful number, since it uses less digits than its factorization.

420503557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11364998.

The product of its (nonzero) digits is 21000, while the sum is 31.

The square root of 420503557 is about 20506.1833845306. The cubic root of 420503557 is about 749.1864107863.

The spelling of 420503557 in words is "four hundred twenty million, five hundred three thousand, five hundred fifty-seven".