20616971424 has 96 divisors (see below), whose sum is σ = 61975872000. Its totient is φ = 5878662912.

The previous prime is 20616971423. The next prime is 20616971461. The reversal of 20616971424 is 42417961602.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (20616971423) 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, 304587 + ... + 366069.

It is an arithmetic number, because the mean of its divisors is an integer number (645582000).

Almost surely, 2^20616971424 is an apocalyptic number.

20616971424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20616971424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30987936000).

20616971424 is an abundant number, since it is smaller than the sum of its proper divisors (41358900576).

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

20616971424 is a wasteful number, since it uses less digits than its factorization.

20616971424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62002 (or 61994 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 20616971424 in words is "twenty billion, six hundred sixteen million, nine hundred seventy-one thousand, four hundred twenty-four".