20018639415 has 16 divisors (see below), whose sum is σ = 32032281600. Its totient is φ = 10675788192.

The previous prime is 20018639411. The next prime is 20018639447. The reversal of 20018639415 is 51493681002.

It is not a de Polignac number, because 20018639415 - 2² = 20018639411 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20018639411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186226 + ... + 273344.

It is an arithmetic number, because the mean of its divisors is an integer number (2002017600).

Almost surely, 2^20018639415 is an apocalyptic number.

20018639415 is a deficient number, since it is larger than the sum of its proper divisors (12013642185).

20018639415 is a wasteful number, since it uses less digits than its factorization.

20018639415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102446.

The product of its (nonzero) digits is 51840, while the sum is 39.

The spelling of 20018639415 in words is "twenty billion, eighteen million, six hundred thirty-nine thousand, four hundred fifteen".