20445213500 has 48 divisors (see below), whose sum is σ = 45154156320. Its totient is φ = 8086179200.

The previous prime is 20445213497. The next prime is 20445213517. The reversal of 20445213500 is 531254402.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20445213500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185222 + ... + 274221.

It is an arithmetic number, because the mean of its divisors is an integer number (940711590).

Almost surely, 2^20445213500 is an apocalyptic number.

20445213500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20445213500 is an abundant number, since it is smaller than the sum of its proper divisors (24708942820).

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

20445213500 is a wasteful number, since it uses less digits than its factorization.

20445213500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459551 (or 459539 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 20445213500 its reverse (531254402), we get a palindrome (20976467902).

The spelling of 20445213500 in words is "twenty billion, four hundred forty-five million, two hundred thirteen thousand, five hundred".