20558604540 has 48 divisors (see below), whose sum is σ = 58134051360. Its totient is φ = 5428012800.

The previous prime is 20558604529. The next prime is 20558604551. The reversal of 20558604540 is 4540685502.

It is an interprime number because it is at equal distance from previous prime (20558604529) and next prime (20558604551).

It is a super-2 number, since 2×20558604540² (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 15 ways as a sum of consecutive naturals, for example, 1690195 + ... + 1702314.

It is an arithmetic number, because the mean of its divisors is an integer number (1211126070).

Almost surely, 2^20558604540 is an apocalyptic number.

20558604540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20558604540 is an abundant number, since it is smaller than the sum of its proper divisors (37575446820).

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

20558604540 is a wasteful number, since it uses less digits than its factorization.

20558604540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3392622 (or 3392620 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 39.

The spelling of 20558604540 in words is "twenty billion, five hundred fifty-eight million, six hundred four thousand, five hundred forty".