20520154215 has 48 divisors (see below), whose sum is σ = 41084218656. Its totient is φ = 9363916800.

The previous prime is 20520154201. The next prime is 20520154241. The reversal of 20520154215 is 51245102502.

20520154215 is a `hidden beast` number, since 205 + 20 + 15 + 421 + 5 = 666.

It is not a de Polignac number, because 20520154215 - 2⁴ = 20520154199 is a prime.

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 47 ways as a sum of consecutive naturals, for example, 1210846 + ... + 1227675.

It is an arithmetic number, because the mean of its divisors is an integer number (855921222).

Almost surely, 2^20520154215 is an apocalyptic number.

20520154215 is an abundant number, since it is smaller than the sum of its proper divisors (20564064441).

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

20520154215 is a wasteful number, since it uses less digits than its factorization.

20520154215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2438560 (or 2438557 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

Adding to 20520154215 its reverse (51245102502), we get a palindrome (71765256717).

The spelling of 20520154215 in words is "twenty billion, five hundred twenty million, one hundred fifty-four thousand, two hundred fifteen".