20115555252520 has 64 divisors (see below), whose sum is σ = 55704614555520. Its totient is φ = 6366241661184.

The previous prime is 20115555252509. The next prime is 20115555252539. The reversal of 20115555252520 is 2525255551102.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2763122082 + ... + 2763129361.

It is an arithmetic number, because the mean of its divisors is an integer number (870384602430).

Almost surely, 2^{20115555252520} is an apocalyptic number.

20115555252520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20115555252520 is an abundant number, since it is smaller than the sum of its proper divisors (35589059303000).

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

20115555252520 is a wasteful number, since it uses less digits than its factorization.

20115555252520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5526251474 (or 5526251470 counting only the distinct ones).

The product of its (nonzero) digits is 250000, while the sum is 40.

The spelling of 20115555252520 in words is "twenty trillion, one hundred fifteen billion, five hundred fifty-five million, two hundred fifty-two thousand, five hundred twenty".