66360020 has 12 divisors (see below), whose sum is σ = 139356084. Its totient is φ = 26544000.

The previous prime is 66360013. The next prime is 66360043. The reversal of 66360020 is 2006366.

It can be written as a sum of positive squares in 2 ways, for example, as 23483716 + 42876304 = 4846^2 + 6548^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1658981 + ... + 1659020.

It is an arithmetic number, because the mean of its divisors is an integer number (11613007).

Almost surely, 2^66360020 is an apocalyptic number.

It is an amenable number.

66360020 is an abundant number, since it is smaller than the sum of its proper divisors (72996064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66360020 is a wasteful number, since it uses less digits than its factorization.

66360020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3318010 (or 3318008 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 66360020 is about 8146.1659693380. The cubic root of 66360020 is about 404.8574817344.

Adding to 66360020 its reverse (2006366), we get a palindrome (68366386).

The spelling of 66360020 in words is "sixty-six million, three hundred sixty thousand, twenty".