20011220015 has 8 divisors (see below), whose sum is σ = 24018303408. Its totient is φ = 16005749760.

The previous prime is 20011219997. The next prime is 20011220027. The reversal of 20011220015 is 51002211002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20011220015 - 2¹² = 20011215919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375821 + ... + 425750.

It is an arithmetic number, because the mean of its divisors is an integer number (3002287926).

Almost surely, 2^20011220015 is an apocalyptic number.

20011220015 is a deficient number, since it is larger than the sum of its proper divisors (4007083393).

20011220015 is an equidigital number, since it uses as much as digits as its factorization.

20011220015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806569.

The product of its (nonzero) digits is 40, while the sum is 14.

Adding to 20011220015 its reverse (51002211002), we get a palindrome (71013431017).

The spelling of 20011220015 in words is "twenty billion, eleven million, two hundred twenty thousand, fifteen".