20920779554220 has 216 divisors, whose sum is σ = 79498962741744. Its totient is φ = 4414054563072.

The previous prime is 20920779554161. The next prime is 20920779554221. The reversal of 20920779554220 is 2245597702902.

20920779554220 is a `hidden beast` number, since 2 + 0 + 9 + 2 + 0 + 7 + 7 + 95 + 542 + 2 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (20920779554221) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 91114974 + ... + 91344293.

It is an arithmetic number, because the mean of its divisors is an integer number (368050753434).

Almost surely, 2^{20920779554220} is an apocalyptic number.

20920779554220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20920779554220 is an abundant number, since it is smaller than the sum of its proper divisors (58578183187524).

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

20920779554220 is a wasteful number, since it uses less digits than its factorization.

20920779554220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182459309 (or 182459297 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 54.

The spelling of 20920779554220 in words is "twenty trillion, nine hundred twenty billion, seven hundred seventy-nine million, five hundred fifty-four thousand, two hundred twenty".