20554423521450 has 288 divisors, whose sum is σ = 63937735848000. Its totient is φ = 4331393740800.

The previous prime is 20554423521439. The next prime is 20554423521521. The reversal of 20554423521450 is 5412532445502.

It is a super-2 number, since 2×20554423521450² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 77358426 + ... + 77623674.

It is an arithmetic number, because the mean of its divisors is an integer number (222006027250).

Almost surely, 2^{20554423521450} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20554423521450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31968867924000).

20554423521450 is an abundant number, since it is smaller than the sum of its proper divisors (43383312326550).

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

20554423521450 is a wasteful number, since it uses less digits than its factorization.

20554423521450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266102 (or 266090 counting only the distinct ones).

The product of its (nonzero) digits is 960000, while the sum is 42.

Adding to 20554423521450 its reverse (5412532445502), we get a palindrome (25966955966952).

The spelling of 20554423521450 in words is "twenty trillion, five hundred fifty-four billion, four hundred twenty-three million, five hundred twenty-one thousand, four hundred fifty".