20280220830 has 128 divisors (see below), whose sum is σ = 55059056640. Its totient is φ = 5311002240.

The previous prime is 20280220819. The next prime is 20280220841. The reversal of 20280220830 is 3802208202.

It is an interprime number because it is at equal distance from previous prime (20280220819) and next prime (20280220841).

It is a super-2 number, since 2×20280220830² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20280220794 and 20280220803.

It is a congruent number.

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 63 ways as a sum of consecutive naturals, for example, 3874315 + ... + 3879545.

It is an arithmetic number, because the mean of its divisors is an integer number (430148880).

Almost surely, 2^20280220830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20280220830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27529528320).

20280220830 is an abundant number, since it is smaller than the sum of its proper divisors (34778835810).

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

20280220830 is a wasteful number, since it uses less digits than its factorization.

20280220830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5503 (or 5497 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The spelling of 20280220830 in words is "twenty billion, two hundred eighty million, two hundred twenty thousand, eight hundred thirty".