20430603508 has 18 divisors (see below), whose sum is σ = 41590871826. Its totient is φ = 8755972848.

The previous prime is 20430603493. The next prime is 20430603517. The reversal of 20430603508 is 80530603402.

It can be written as a sum of positive squares in only one way, i.e., 19435705744 + 994897764 = 139412^2 + 31542^2 .

It is a super-2 number, since 2×20430603508² (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 20430603508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52118691 + ... + 52119082.

Almost surely, 2^20430603508 is an apocalyptic number.

20430603508 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20430603508 is an abundant number, since it is smaller than the sum of its proper divisors (21160268318).

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

20430603508 is a wasteful number, since it uses less digits than its factorization.

20430603508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104237791 (or 104237782 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The spelling of 20430603508 in words is "twenty billion, four hundred thirty million, six hundred three thousand, five hundred eight".