20467544147449 has 9 divisors (see below), whose sum is σ = 23809220847471. Its totient is φ = 17543582124600.

The previous prime is 20467544147443. The next prime is 20467544147459. The reversal of 20467544147449 is 94474144576402.

The square root of 20467544147449 is 4524107.

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., 17751837903849 + 2715706243600 = 4213293^2 + 1647940^2 .

It is not a de Polignac number, because 20467544147449 - 2³¹ = 20465396663801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20467544147443) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 31345599 + ... + 31991899.

Almost surely, 2^{20467544147449} is an apocalyptic number.

20467544147449 is the 4524107-th square number.

20467544147449 is the 2262054-th centered octagonal number.

It is an amenable number.

20467544147449 is a deficient number, since it is larger than the sum of its proper divisors (3341676700022).

20467544147449 is an frugal number, since it uses more digits than its factorization.

20467544147449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292616 (or 646308 counting only the distinct ones).

The product of its (nonzero) digits is 108380160, while the sum is 61.

The spelling of 20467544147449 in words is "twenty trillion, four hundred sixty-seven billion, five hundred forty-four million, one hundred forty-seven thousand, four hundred forty-nine".