20205551442 has 64 divisors (see below), whose sum is σ = 42167107584. Its totient is φ = 6447625920.

The previous prime is 20205551423. The next prime is 20205551479. The reversal of 20205551442 is 24415550202.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 6925368 + ... + 6928284.

It is an arithmetic number, because the mean of its divisors is an integer number (658861056).

Almost surely, 2^20205551442 is an apocalyptic number.

20205551442 is an abundant number, since it is smaller than the sum of its proper divisors (21961556142).

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

20205551442 is a wasteful number, since it uses less digits than its factorization.

20205551442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3343.

The product of its (nonzero) digits is 16000, while the sum is 30.

The spelling of 20205551442 in words is "twenty billion, two hundred five million, five hundred fifty-one thousand, four hundred forty-two".