20916408518 has 8 divisors (see below), whose sum is σ = 32738726448. Its totient is φ = 10003499704.

The previous prime is 20916408509. The next prime is 20916408547. The reversal of 20916408518 is 81580461902.

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

It is a super-2 number, since 2×20916408518² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227352221 + ... + 227352312.

It is an arithmetic number, because the mean of its divisors is an integer number (4092340806).

Almost surely, 2^20916408518 is an apocalyptic number.

20916408518 is a deficient number, since it is larger than the sum of its proper divisors (11822317930).

20916408518 is a wasteful number, since it uses less digits than its factorization.

20916408518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454704558.

The product of its (nonzero) digits is 138240, while the sum is 44.

The spelling of 20916408518 in words is "twenty billion, nine hundred sixteen million, four hundred eight thousand, five hundred eighteen".