20520100202155 has 32 divisors (see below), whose sum is σ = 25110002903040. Its totient is φ = 16094950421760.

The previous prime is 20520100202137. The next prime is 20520100202227. The reversal of 20520100202155 is 55120200102502.

It is not a de Polignac number, because 20520100202155 - 2¹¹ = 20520100200107 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52931554 + ... + 53317816.

It is an arithmetic number, because the mean of its divisors is an integer number (784687590720).

Almost surely, 2^{20520100202155} is an apocalyptic number.

20520100202155 is a deficient number, since it is larger than the sum of its proper divisors (4589902700885).

20520100202155 is a wasteful number, since it uses less digits than its factorization.

20520100202155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387171.

The product of its (nonzero) digits is 2000, while the sum is 25.

Adding to 20520100202155 its reverse (55120200102502), we get a palindrome (75640300304657).

The spelling of 20520100202155 in words is "twenty trillion, five hundred twenty billion, one hundred million, two hundred two thousand, one hundred fifty-five".