20733984049 has 9 divisors (see below), whose sum is σ = 20845890489. Its totient is φ = 20622677460.

The previous prime is 20733984001. The next prime is 20733984109. The reversal of 20733984049 is 94048933702.

It is a happy number.

The square root of 20733984049 is 143993.

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

It is not a de Polignac number, because 20733984049 - 2⁹ = 20733983537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20733983993 and 20733984011.

It is not an unprimeable number, because it can be changed into a prime (20733984149) 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, 44781592 + ... + 44782054.

Almost surely, 2^20733984049 is an apocalyptic number.

20733984049 is the 143993-rd square number.

20733984049 is the 71997-th centered octagonal number.

It is an amenable number.

20733984049 is a deficient number, since it is larger than the sum of its proper divisors (111906440).

20733984049 is an frugal number, since it uses more digits than its factorization.

20733984049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548 (or 774 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 49.

Multiplying 20733984049 by its sum of digits (49), we get a square (1015965218401 = 1007951²).

The spelling of 20733984049 in words is "twenty billion, seven hundred thirty-three million, nine hundred eighty-four thousand, forty-nine".