20634599424 has 68 divisors (see below), whose sum is σ = 55025702936. Its totient is φ = 6878134272.

The previous prime is 20634599411. The next prime is 20634599429. The reversal of 20634599424 is 42499543602.

It is a super-2 number, since 2×20634599424² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (20634599429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144132 + ... + 249084.

Almost surely, 2^20634599424 is an apocalyptic number.

20634599424 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 20634599424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27512851468).

20634599424 is an abundant number, since it is smaller than the sum of its proper divisors (34391103512).

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

20634599424 is an frugal number, since it uses more digits than its factorization.

20634599424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104988 (or 104958 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 48.

The spelling of 20634599424 in words is "twenty billion, six hundred thirty-four million, five hundred ninety-nine thousand, four hundred twenty-four".