20545400000 has 168 divisors, whose sum is σ = 52165879920. Its totient is φ = 8023680000.

The previous prime is 20545399939. The next prime is 20545400023. The reversal of 20545400000 is 454502.

It is a happy number.

It is a super-2 number, since 2×20545400000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8598806 + ... + 8601194.

It is an arithmetic number, because the mean of its divisors is an integer number (310511190).

Almost surely, 2^20545400000 is an apocalyptic number.

20545400000 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 20545400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26082939960).

20545400000 is an abundant number, since it is smaller than the sum of its proper divisors (31620479920).

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

20545400000 is an frugal number, since it uses more digits than its factorization.

20545400000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469 (or 2439 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

Adding to 20545400000 its reverse (454502), we get a palindrome (20545854502).

The spelling of 20545400000 in words is "twenty billion, five hundred forty-five million, four hundred thousand".