20016393481 has 4 divisors (see below), whose sum is σ = 22875878272. Its totient is φ = 17156908692.

The previous prime is 20016393473. The next prime is 20016393497. The reversal of 20016393481 is 18439361002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20016393481 - 2³ = 20016393473 is a prime.

It is a super-2 number, since 2×20016393481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20016393481.

It is not an unprimeable number, because it can be changed into a prime (20016393401) 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, 1429742385 + ... + 1429742398.

It is an arithmetic number, because the mean of its divisors is an integer number (5718969568).

Almost surely, 2^20016393481 is an apocalyptic number.

It is an amenable number.

20016393481 is a deficient number, since it is larger than the sum of its proper divisors (2859484791).

20016393481 is an equidigital number, since it uses as much as digits as its factorization.

20016393481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2859484790.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 20016393481 in words is "twenty billion, sixteen million, three hundred ninety-three thousand, four hundred eighty-one".