420020555 has 16 divisors (see below), whose sum is σ = 531083520. Its totient is φ = 318012768.

The previous prime is 420020551. The next prime is 420020561. The reversal of 420020555 is 555020024.

It is a cyclic number.

It is not a de Polignac number, because 420020555 - 2² = 420020551 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420020555.

It is not an unprimeable number, because it can be changed into a prime (420020551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143234 + ... + 146136.

It is an arithmetic number, because the mean of its divisors is an integer number (33192720).

Almost surely, 2^420020555 is an apocalyptic number.

420020555 is a deficient number, since it is larger than the sum of its proper divisors (111062965).

420020555 is a wasteful number, since it uses less digits than its factorization.

420020555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4450.

The product of its (nonzero) digits is 2000, while the sum is 23.

The square root of 420020555 is about 20494.4030164335. The cubic root of 420020555 is about 748.8994554886.

Adding to 420020555 its reverse (555020024), we get a palindrome (975040579).

The spelling of 420020555 in words is "four hundred twenty million, twenty thousand, five hundred fifty-five".