20015256771220 has 48 divisors (see below), whose sum is σ = 43064560139328. Its totient is φ = 7809498717440.

The previous prime is 20015256771131. The next prime is 20015256771247. The reversal of 20015256771220 is 2217765251002.

It is a super-2 number, since 2×20015256771220² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2730759 + ... + 6891121.

It is an arithmetic number, because the mean of its divisors is an integer number (897178336236).

Almost surely, 2^{20015256771220} is an apocalyptic number.

20015256771220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20015256771220 is an abundant number, since it is smaller than the sum of its proper divisors (23049303368108).

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

20015256771220 is a wasteful number, since it uses less digits than its factorization.

20015256771220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166280 (or 4166278 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 40.

The spelling of 20015256771220 in words is "twenty trillion, fifteen billion, two hundred fifty-six million, seven hundred seventy-one thousand, two hundred twenty".