20958005378 has 6 divisors (see below), whose sum is σ = 31437315171. Its totient is φ = 10478900322.

The previous prime is 20958005377. The next prime is 20958005437. The reversal of 20958005378 is 87350085902.

It can be written as a sum of positive squares in only one way, i.e., 10479002689 + 10479002689 = 102367^2 + 102367^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=102367.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20958005371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 153551 + ... + 255917.

Almost surely, 2^20958005378 is an apocalyptic number.

20958005378 is a deficient number, since it is larger than the sum of its proper divisors (10479309793).

20958005378 is an frugal number, since it uses more digits than its factorization.

20958005378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204736 (or 102369 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 20958005378 in words is "twenty billion, nine hundred fifty-eight million, five thousand, three hundred seventy-eight".