20510120215 has 16 divisors (see below), whose sum is σ = 26508436416. Its totient is φ = 15144192000.

The previous prime is 20510120179. The next prime is 20510120231. The reversal of 20510120215 is 51202101502.

It is a de Polignac number, because none of the positive numbers 2^k-20510120215 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20510120192 and 20510120201.

It is a congruent number.

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, 925110 + ... + 947020.

It is an arithmetic number, because the mean of its divisors is an integer number (1656777276).

Almost surely, 2^20510120215 is an apocalyptic number.

20510120215 is a deficient number, since it is larger than the sum of its proper divisors (5998316201).

20510120215 is a wasteful number, since it uses less digits than its factorization.

20510120215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36330.

The product of its (nonzero) digits is 200, while the sum is 19.

Adding to 20510120215 its reverse (51202101502), we get a palindrome (71712221717).

The spelling of 20510120215 in words is "twenty billion, five hundred ten million, one hundred twenty thousand, two hundred fifteen".