20818612449 has 12 divisors (see below), whose sum is σ = 31378778496. Its totient is φ = 13275636792.

The previous prime is 20818612427. The next prime is 20818612513. The reversal of 20818612449 is 94421681802.

20818612449 is a `hidden beast` number, since 20 + 8 + 1 + 8 + 612 + 4 + 4 + 9 = 666.

It is not a de Polignac number, because 20818612449 - 2⁸ = 20818612193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20818612049) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50286297 + ... + 50286710.

It is an arithmetic number, because the mean of its divisors is an integer number (2614898208).

Almost surely, 2^20818612449 is an apocalyptic number.

It is an amenable number.

20818612449 is a deficient number, since it is larger than the sum of its proper divisors (10560166047).

20818612449 is a wasteful number, since it uses less digits than its factorization.

20818612449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100573036 (or 100573033 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The spelling of 20818612449 in words is "twenty billion, eight hundred eighteen million, six hundred twelve thousand, four hundred forty-nine".