20381853550 has 12 divisors (see below), whose sum is σ = 37910247696. Its totient is φ = 8152741400.

The previous prime is 20381853521. The next prime is 20381853563. The reversal of 20381853550 is 5535818302.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 203818486 + ... + 203818585.

It is an arithmetic number, because the mean of its divisors is an integer number (3159187308).

Almost surely, 2^20381853550 is an apocalyptic number.

20381853550 is a deficient number, since it is larger than the sum of its proper divisors (17528394146).

20381853550 is a wasteful number, since it uses less digits than its factorization.

20381853550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407637083 (or 407637078 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 20381853550 in words is "twenty billion, three hundred eighty-one million, eight hundred fifty-three thousand, five hundred fifty".