20151530442 has 24 divisors (see below), whose sum is σ = 43665058944. Its totient is φ = 6716652264.

The previous prime is 20151530401. The next prime is 20151530491. The reversal of 20151530442 is 24403515102.

20151530442 is a `hidden beast` number, since 20 + 151 + 53 + 0 + 442 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 244573 + ... + 316415.

It is an arithmetic number, because the mean of its divisors is an integer number (1819377456).

Almost surely, 2^20151530442 is an apocalyptic number.

20151530442 is an abundant number, since it is smaller than the sum of its proper divisors (23513528502).

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

20151530442 is a wasteful number, since it uses less digits than its factorization.

20151530442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87434 (or 87431 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 20151530442 in words is "twenty billion, one hundred fifty-one million, five hundred thirty thousand, four hundred forty-two".