20155025442 has 32 divisors (see below), whose sum is σ = 42088983552. Its totient is φ = 6422218704.

The previous prime is 20155025383. The next prime is 20155025537. The reversal of 20155025442 is 24452055102.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 179643 + ... + 269409.

It is an arithmetic number, because the mean of its divisors is an integer number (1315280736).

Almost surely, 2^20155025442 is an apocalyptic number.

20155025442 is an abundant number, since it is smaller than the sum of its proper divisors (21933958110).

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

20155025442 is a wasteful number, since it uses less digits than its factorization.

20155025442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91422.

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

The spelling of 20155025442 in words is "twenty billion, one hundred fifty-five million, twenty-five thousand, four hundred forty-two".