20520432331554 has 16 divisors (see below), whose sum is σ = 41048639089920. Its totient is φ = 6838848372720.

The previous prime is 20520432331543. The next prime is 20520432331571. The reversal of 20520432331554 is 45513323402502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323900137 + ... + 323963484.

It is an arithmetic number, because the mean of its divisors is an integer number (2565539943120).

Almost surely, 2^{20520432331554} is an apocalyptic number.

20520432331554 is an abundant number, since it is smaller than the sum of its proper divisors (20528206758366).

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

20520432331554 is a wasteful number, since it uses less digits than its factorization.

20520432331554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647868905.

The product of its (nonzero) digits is 432000, while the sum is 39.

The spelling of 20520432331554 in words is "twenty trillion, five hundred twenty billion, four hundred thirty-two million, three hundred thirty-one thousand, five hundred fifty-four".