20819773556480 has 72 divisors (see below), whose sum is σ = 50810804839872. Its totient is φ = 8170779029504.

The previous prime is 20819773556453. The next prime is 20819773556531. The reversal of 20819773556480 is 8465537791802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153379784 + ... + 153515463.

It is an arithmetic number, because the mean of its divisors is an integer number (705705622776).

It is a 1-persistent number, because it is pandigital, but 2⋅20819773556480 = 41639547112960 is not.

Almost surely, 2^{20819773556480} is an apocalyptic number.

20819773556480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20819773556480 is an abundant number, since it is smaller than the sum of its proper divisors (29991031283392).

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

20819773556480 is an equidigital number, since it uses as much as digits as its factorization.

20819773556480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306895321 (or 306895307 counting only the distinct ones).

The product of its (nonzero) digits is 101606400, while the sum is 65.

The spelling of 20819773556480 in words is "twenty trillion, eight hundred nineteen billion, seven hundred seventy-three million, five hundred fifty-six thousand, four hundred eighty".