20019201550 has 12 divisors (see below), whose sum is σ = 37235714976. Its totient is φ = 8007680600.

The previous prime is 20019201523. The next prime is 20019201563. The reversal of 20019201550 is 5510291002.

It is a Harshad number since it is a multiple of its sum of digits (25).

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, 200191966 + ... + 200192065.

It is an arithmetic number, because the mean of its divisors is an integer number (3102976248).

Almost surely, 2^20019201550 is an apocalyptic number.

20019201550 is a deficient number, since it is larger than the sum of its proper divisors (17216513426).

20019201550 is a wasteful number, since it uses less digits than its factorization.

20019201550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400384043 (or 400384038 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

Adding to 20019201550 its reverse (5510291002), we get a palindrome (25529492552).

The spelling of 20019201550 in words is "twenty billion, nineteen million, two hundred one thousand, five hundred fifty".