20660420002 has 4 divisors (see below), whose sum is σ = 30990630006. Its totient is φ = 10330210000.

The previous prime is 20660419999. The next prime is 20660420041. The reversal of 20660420002 is 20002406602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20002406602 = 2 ⋅10001203301.

It can be written as a sum of positive squares in only one way, i.e., 18876286881 + 1784133121 = 137391^2 + 42239^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5165104999 + ... + 5165105002.

Almost surely, 2^20660420002 is an apocalyptic number.

20660420002 is a deficient number, since it is larger than the sum of its proper divisors (10330210004).

20660420002 is a wasteful number, since it uses less digits than its factorization.

20660420002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10330210003.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 20660420002 its reverse (20002406602), we get a palindrome (40662826604).

The spelling of 20660420002 in words is "twenty billion, six hundred sixty million, four hundred twenty thousand, two".