20555450400 has 144 divisors (see below), whose sum is σ = 66969401184. Its totient is φ = 5476423680.

The previous prime is 20555450393. The next prime is 20555450437. The reversal of 20555450400 is 405455502.

It is a super-2 number, since 2×20555450400² (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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3133524 + ... + 3140076.

It is an arithmetic number, because the mean of its divisors is an integer number (465065286).

Almost surely, 2^20555450400 is an apocalyptic number.

20555450400 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 20555450400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33484700592).

20555450400 is an abundant number, since it is smaller than the sum of its proper divisors (46413950784).

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

20555450400 is a wasteful number, since it uses less digits than its factorization.

20555450400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7883 (or 7870 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 30.

The spelling of 20555450400 in words is "twenty billion, five hundred fifty-five million, four hundred fifty thousand, four hundred".