20879215500 has 288 divisors, whose sum is σ = 71978961600. Its totient is φ = 4671744000.

The previous prime is 20879215457. The next prime is 20879215543. The reversal of 20879215500 is 551297802.

It is an interprime number because it is at equal distance from previous prime (20879215457) and next prime (20879215543).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2355076 + ... + 2363924.

It is an arithmetic number, because the mean of its divisors is an integer number (249926950).

Almost surely, 2^20879215500 is an apocalyptic number.

20879215500 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 20879215500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35989480800).

20879215500 is an abundant number, since it is smaller than the sum of its proper divisors (51099746100).

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

20879215500 is a wasteful number, since it uses less digits than its factorization.

20879215500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8906 (or 8883 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 39.

The spelling of 20879215500 in words is "twenty billion, eight hundred seventy-nine million, two hundred fifteen thousand, five hundred".