20558620620 has 144 divisors (see below), whose sum is σ = 64562359680. Its totient is φ = 5291993088.

The previous prime is 20558620613. The next prime is 20558620657. The reversal of 20558620620 is 2602685502.

20558620620 is a `hidden beast` number, since 2 + 0 + 5 + 5 + 8 + 6 + 20 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 600936 + ... + 634224.

It is an arithmetic number, because the mean of its divisors is an integer number (448349720).

Almost surely, 2^20558620620 is an apocalyptic number.

20558620620 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 20558620620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32281179840).

20558620620 is an abundant number, since it is smaller than the sum of its proper divisors (44003739060).

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

20558620620 is a wasteful number, since it uses less digits than its factorization.

20558620620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33424 (or 33419 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 20558620620 in words is "twenty billion, five hundred fifty-eight million, six hundred twenty thousand, six hundred twenty".