20091902450 has 48 divisors (see below), whose sum is σ = 39982827840. Its totient is φ = 7488936000.

The previous prime is 20091902449. The next prime is 20091902459. The reversal of 20091902450 is 5420919002.

It is not an unprimeable number, because it can be changed into a prime (20091902459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115406 + ... + 231305.

It is an arithmetic number, because the mean of its divisors is an integer number (832975580).

Almost surely, 2^20091902450 is an apocalyptic number.

20091902450 is a deficient number, since it is larger than the sum of its proper divisors (19890925390).

20091902450 is a wasteful number, since it uses less digits than its factorization.

20091902450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346803 (or 346798 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The spelling of 20091902450 in words is "twenty billion, ninety-one million, nine hundred two thousand, four hundred fifty".