20146679720 has 64 divisors (see below), whose sum is σ = 46601740800. Its totient is φ = 7834867200.

The previous prime is 20146679699. The next prime is 20146679741. The reversal of 20146679720 is 2797664102.

It is a Cunningham number, because it is equal to 141939²-1.

It is an interprime number because it is at equal distance from previous prime (20146679699) and next prime (20146679741).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248396 + ... + 319364.

It is an arithmetic number, because the mean of its divisors is an integer number (728152200).

Almost surely, 2^20146679720 is an apocalyptic number.

20146679720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20146679720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23300870400).

20146679720 is an abundant number, since it is smaller than the sum of its proper divisors (26455061080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20146679720 is a wasteful number, since it uses less digits than its factorization.

20146679720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71178 (or 71174 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 44.

The spelling of 20146679720 in words is "twenty billion, one hundred forty-six million, six hundred seventy-nine thousand, seven hundred twenty".