20909547896 has 8 divisors (see below), whose sum is σ = 39205402320. Its totient is φ = 10454773944.

The previous prime is 20909547793. The next prime is 20909547913. The reversal of 20909547896 is 69874590902.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1306846736 + ... + 1306846751.

It is an arithmetic number, because the mean of its divisors is an integer number (4900675290).

Almost surely, 2^20909547896 is an apocalyptic number.

It is an amenable number.

20909547896 is a deficient number, since it is larger than the sum of its proper divisors (18295854424).

20909547896 is a wasteful number, since it uses less digits than its factorization.

20909547896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2613693493 (or 2613693489 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 59.

The spelling of 20909547896 in words is "twenty billion, nine hundred nine million, five hundred forty-seven thousand, eight hundred ninety-six".