20066402640 has 40 divisors (see below), whose sum is σ = 62205848928. Its totient is φ = 5351040640.

The previous prime is 20066402623. The next prime is 20066402669. The reversal of 20066402640 is 4620466002.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20066402598 and 20066402607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41804766 + ... + 41805245.

Almost surely, 2^20066402640 is an apocalyptic number.

20066402640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20066402640 is an abundant number, since it is smaller than the sum of its proper divisors (42139446288).

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

20066402640 is a wasteful number, since it uses less digits than its factorization.

20066402640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83610027 (or 83610021 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 20066402640 its reverse (4620466002), we get a palindrome (24686868642).

The spelling of 20066402640 in words is "twenty billion, sixty-six million, four hundred two thousand, six hundred forty".