20161257424 has 80 divisors (see below), whose sum is σ = 48916440576. Its totient is φ = 7820323200.

The previous prime is 20161257421. The next prime is 20161257449. The reversal of 20161257424 is 42475216102.

It is a self number, because there is not a number n which added to its sum of digits gives 20161257424.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20161257421) 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, 243619 + ... + 315709.

Almost surely, 2^20161257424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20161257424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24458220288).

20161257424 is an abundant number, since it is smaller than the sum of its proper divisors (28755183152).

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

20161257424 is a wasteful number, since it uses less digits than its factorization.

20161257424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72344 (or 72338 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The spelling of 20161257424 in words is "twenty billion, one hundred sixty-one million, two hundred fifty-seven thousand, four hundred twenty-four".