20525021020155 has 16 divisors (see below), whose sum is σ = 32840312154624. Its totient is φ = 10946585036640.

The previous prime is 20525021020057. The next prime is 20525021020181. The reversal of 20525021020155 is 55102012052502.

It is not a de Polignac number, because 20525021020155 - 2¹⁴ = 20525021003771 is a prime.

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, 3956019 + ... + 7529948.

It is an arithmetic number, because the mean of its divisors is an integer number (2052519509664).

Almost surely, 2^{20525021020155} is an apocalyptic number.

20525021020155 is a deficient number, since it is larger than the sum of its proper divisors (12315291134469).

20525021020155 is a wasteful number, since it uses less digits than its factorization.

20525021020155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11605106.

The product of its (nonzero) digits is 10000, while the sum is 30.

Adding to 20525021020155 its reverse (55102012052502), we get a palindrome (75627033072657).

The spelling of 20525021020155 in words is "twenty trillion, five hundred twenty-five billion, twenty-one million, twenty thousand, one hundred fifty-five".