20605863508 has 48 divisors (see below), whose sum is σ = 38374459200. Its totient is φ = 9654128640.

The previous prime is 20605863491. The next prime is 20605863511. The reversal of 20605863508 is 80536850602.

It is a happy number.

It is a super-2 number, since 2×20605863508² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3152788 + ... + 3159316.

It is an arithmetic number, because the mean of its divisors is an integer number (799467900).

Almost surely, 2^20605863508 is an apocalyptic number.

It is an amenable number.

20605863508 is a deficient number, since it is larger than the sum of its proper divisors (17768595692).

20605863508 is a wasteful number, since it uses less digits than its factorization.

20605863508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7000 (or 6998 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 20605863508 in words is "twenty billion, six hundred five million, eight hundred sixty-three thousand, five hundred eight".