20640553015 has 8 divisors (see below), whose sum is σ = 24911836128. Its totient is φ = 16416994080.

The previous prime is 20640553013. The next prime is 20640553019. The reversal of 20640553015 is 51035504602.

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

It is not a de Polignac number, because 20640553015 - 2¹ = 20640553013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20640553013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11930091 + ... + 11931820.

It is an arithmetic number, because the mean of its divisors is an integer number (3113979516).

Almost surely, 2^20640553015 is an apocalyptic number.

20640553015 is a deficient number, since it is larger than the sum of its proper divisors (4271283113).

20640553015 is a wasteful number, since it uses less digits than its factorization.

20640553015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23862089.

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 20640553015 in words is "twenty billion, six hundred forty million, five hundred fifty-three thousand, fifteen".