20499469637956 has 9 divisors (see below), whose sum is σ = 35874087713149. Its totient is φ = 10249730291344.

The previous prime is 20499469637893. The next prime is 20499469637963. The reversal of 20499469637956 is 65973696499402.

The square root of 20499469637956 is 4527634.

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

It can be written as a sum of positive squares in only one way, i.e., 20109574296900 + 389895341056 = 4484370^2 + 624416^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7923360 + ... + 10187176.

Almost surely, 2^{20499469637956} is an apocalyptic number.

20499469637956 is the 4527634-th square number.

It is an amenable number.

20499469637956 is a deficient number, since it is larger than the sum of its proper divisors (15374618075193).

20499469637956 is an frugal number, since it uses more digits than its factorization.

20499469637956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4527638 (or 2263819 counting only the distinct ones).

The product of its (nonzero) digits is 4761711360, while the sum is 79.

The spelling of 20499469637956 in words is "twenty trillion, four hundred ninety-nine billion, four hundred sixty-nine million, six hundred thirty-seven thousand, nine hundred fifty-six".