20642443500 has 192 divisors, whose sum is σ = 68827659264. Its totient is φ = 4709376000.

The previous prime is 20642443499. The next prime is 20642443541. The reversal of 20642443500 is 534424602.

It is a super-2 number, since 2×20642443500² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6728967 + ... + 6732033.

It is an arithmetic number, because the mean of its divisors is an integer number (358477392).

Almost surely, 2^20642443500 is an apocalyptic number.

20642443500 is a gapful number since it is divisible by the number (20) 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 20642443500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34413829632).

20642443500 is an abundant number, since it is smaller than the sum of its proper divisors (48185215764).

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

20642443500 is a wasteful number, since it uses less digits than its factorization.

20642443500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3737 (or 3725 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 30.

The spelling of 20642443500 in words is "twenty billion, six hundred forty-two million, four hundred forty-three thousand, five hundred".