20405224554 has 64 divisors (see below), whose sum is σ = 48484033920. Its totient is φ = 5643601920.

The previous prime is 20405224549. The next prime is 20405224573. The reversal of 20405224554 is 45542250402.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57247 + ... + 209970.

It is an arithmetic number, because the mean of its divisors is an integer number (757563030).

Almost surely, 2^20405224554 is an apocalyptic number.

20405224554 is an abundant number, since it is smaller than the sum of its proper divisors (28078809366).

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

20405224554 is a wasteful number, since it uses less digits than its factorization.

20405224554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267335.

The product of its (nonzero) digits is 64000, while the sum is 33.

Adding to 20405224554 its reverse (45542250402), we get a palindrome (65947474956).

The spelling of 20405224554 in words is "twenty billion, four hundred five million, two hundred twenty-four thousand, five hundred fifty-four".