20381909142 has 32 divisors (see below), whose sum is σ = 46792472832. Its totient is φ = 5797746144.

The previous prime is 20381909131. The next prime is 20381909147. The reversal of 20381909142 is 24190918302.

It is a self number, because there is not a number n which added to its sum of digits gives 20381909142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20381909147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1059373 + ... + 1078440.

It is an arithmetic number, because the mean of its divisors is an integer number (1462264776).

Almost surely, 2^20381909142 is an apocalyptic number.

20381909142 is an abundant number, since it is smaller than the sum of its proper divisors (26410563690).

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

20381909142 is a wasteful number, since it uses less digits than its factorization.

20381909142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2138052.

The product of its (nonzero) digits is 31104, while the sum is 39.

The spelling of 20381909142 in words is "twenty billion, three hundred eighty-one million, nine hundred nine thousand, one hundred forty-two".