20105538436 has 27 divisors (see below), whose sum is σ = 36372198807. Its totient is φ = 9724232520.

The previous prime is 20105538347. The next prime is 20105538491. The reversal of 20105538436 is 63483550102.

The square root of 20105538436 is 141794.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20105538395 and 20105538404.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8790085 + ... + 8792371.

Almost surely, 2^20105538436 is an apocalyptic number.

20105538436 is the 141794-th square number.

It is an amenable number.

20105538436 is a deficient number, since it is larger than the sum of its proper divisors (16266660371).

20105538436 is an frugal number, since it uses more digits than its factorization.

20105538436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4640 (or 2320 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 20105538436 in words is "twenty billion, one hundred five million, five hundred thirty-eight thousand, four hundred thirty-six".