20424012550 has 24 divisors (see below), whose sum is σ = 38004605496. Its totient is φ = 8166176640.

The previous prime is 20424012523. The next prime is 20424012563. The reversal of 20424012550 is 5521042402.

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 11 ways as a sum of consecutive naturals, for example, 36349 + ... + 205351.

It is an arithmetic number, because the mean of its divisors is an integer number (1583525229).

Almost surely, 2^20424012550 is an apocalyptic number.

20424012550 is a deficient number, since it is larger than the sum of its proper divisors (17580592946).

20424012550 is a wasteful number, since it uses less digits than its factorization.

20424012550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171432 (or 171427 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

Adding to 20424012550 its reverse (5521042402), we get a palindrome (25945054952).

The spelling of 20424012550 in words is "twenty billion, four hundred twenty-four million, twelve thousand, five hundred fifty".