20903351660 has 24 divisors (see below), whose sum is σ = 43920137520. Its totient is φ = 8356940864.

The previous prime is 20903351647. The next prime is 20903351741. The reversal of 20903351660 is 6615330902.

It is a super-2 number, since 2×20903351660² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20903351660.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235895 + ... + 312174.

It is an arithmetic number, because the mean of its divisors is an integer number (1830005730).

Almost surely, 2^20903351660 is an apocalyptic number.

20903351660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20903351660 is an abundant number, since it is smaller than the sum of its proper divisors (23016785860).

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

20903351660 is a wasteful number, since it uses less digits than its factorization.

20903351660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549985 (or 549983 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 35.

The spelling of 20903351660 in words is "twenty billion, nine hundred three million, three hundred fifty-one thousand, six hundred sixty".