20105445400 has 48 divisors (see below), whose sum is σ = 48777570000. Its totient is φ = 7692516480.

The previous prime is 20105445383. The next prime is 20105445439. The reversal of 20105445400 is 454450102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2180775 + ... + 2189974.

It is an arithmetic number, because the mean of its divisors is an integer number (1016199375).

Almost surely, 2^20105445400 is an apocalyptic number.

20105445400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20105445400 is an abundant number, since it is smaller than the sum of its proper divisors (28672124600).

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

20105445400 is a wasteful number, since it uses less digits than its factorization.

20105445400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4370788 (or 4370779 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

Adding to 20105445400 its reverse (454450102), we get a palindrome (20559895502).

The spelling of 20105445400 in words is "twenty billion, one hundred five million, four hundred forty-five thousand, four hundred".