20005349478 has 16 divisors (see below), whose sum is σ = 40027281840. Its totient is φ = 6665686016.

The previous prime is 20005349461. The next prime is 20005349479. The reversal of 20005349478 is 87494350002.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005349479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 675243 + ... + 704246.

It is an arithmetic number, because the mean of its divisors is an integer number (2501705115).

Almost surely, 2^20005349478 is an apocalyptic number.

20005349478 is an abundant number, since it is smaller than the sum of its proper divisors (20021932362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20005349478 is a wasteful number, since it uses less digits than its factorization.

20005349478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381911.

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 20005349478 in words is "twenty billion, five million, three hundred forty-nine thousand, four hundred seventy-eight".