20005542215 has 4 divisors (see below), whose sum is σ = 24006650664. Its totient is φ = 16004433768.

The previous prime is 20005542211. The next prime is 20005542223. The reversal of 20005542215 is 51224550002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51224550002 = 2 ⋅25612275001.

It is a cyclic number.

It is not a de Polignac number, because 20005542215 - 2² = 20005542211 is a prime.

It is a super-2 number, since 2×20005542215² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005542211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2000554217 + ... + 2000554226.

It is an arithmetic number, because the mean of its divisors is an integer number (6001662666).

Almost surely, 2^20005542215 is an apocalyptic number.

20005542215 is a deficient number, since it is larger than the sum of its proper divisors (4001108449).

20005542215 is an equidigital number, since it uses as much as digits as its factorization.

20005542215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4001108448.

The product of its (nonzero) digits is 4000, while the sum is 26.

The spelling of 20005542215 in words is "twenty billion, five million, five hundred forty-two thousand, two hundred fifteen".