20654015449 has 4 divisors (see below), whose sum is σ = 20658542464. Its totient is φ = 20649488436.

The previous prime is 20654015443. The next prime is 20654015489. The reversal of 20654015449 is 94451045602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94451045602 = 2 ⋅47225522801.

It is a cyclic number.

It is not a de Polignac number, because 20654015449 - 2¹⁹ = 20653491161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20654015443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2256657 + ... + 2265790.

It is an arithmetic number, because the mean of its divisors is an integer number (5164635616).

Almost surely, 2^20654015449 is an apocalyptic number.

It is an amenable number.

20654015449 is a deficient number, since it is larger than the sum of its proper divisors (4527015).

20654015449 is an equidigital number, since it uses as much as digits as its factorization.

20654015449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4527014.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 20654015449 in words is "twenty billion, six hundred fifty-four million, fifteen thousand, four hundred forty-nine".