20424501556 has 48 divisors (see below), whose sum is σ = 38841586560. Its totient is φ = 9361802240.

The previous prime is 20424501551. The next prime is 20424501583. The reversal of 20424501556 is 65510542402.

It is a super-2 number, since 2×20424501556² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424501551) 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, 375240 + ... + 426208.

It is an arithmetic number, because the mean of its divisors is an integer number (809199720).

Almost surely, 2^20424501556 is an apocalyptic number.

It is an amenable number.

20424501556 is a deficient number, since it is larger than the sum of its proper divisors (18417085004).

20424501556 is a wasteful number, since it uses less digits than its factorization.

20424501556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51144 (or 51142 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 34.

The spelling of 20424501556 in words is "twenty billion, four hundred twenty-four million, five hundred one thousand, five hundred fifty-six".