20402000660460 has 24 divisors (see below), whose sum is σ = 57125601849456. Its totient is φ = 5440533509440.

The previous prime is 20402000660429. The next prime is 20402000660473. The reversal of 20402000660460 is 6406600020402.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170016672111 + ... + 170016672230.

It is an arithmetic number, because the mean of its divisors is an integer number (2380233410394).

Almost surely, 2^{20402000660460} is an apocalyptic number.

20402000660460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20402000660460 is an abundant number, since it is smaller than the sum of its proper divisors (36723601188996).

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

20402000660460 is a wasteful number, since it uses less digits than its factorization.

20402000660460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340033344353 (or 340033344351 counting only the distinct ones).

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

Adding to 20402000660460 its reverse (6406600020402), we get a palindrome (26808600680862).

The spelling of 20402000660460 in words is "twenty trillion, four hundred two billion, six hundred sixty thousand, four hundred sixty".