20558620621 has 16 divisors (see below), whose sum is σ = 25635414528. Its totient is φ = 16017274800.

The previous prime is 20558620613. The next prime is 20558620657. The reversal of 20558620621 is 12602685502.

It is a cyclic number.

It is not a de Polignac number, because 20558620621 - 2³ = 20558620613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20558620601) by changing a digit.

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, 622306 + ... + 654508.

It is an arithmetic number, because the mean of its divisors is an integer number (1602213408).

Almost surely, 2^20558620621 is an apocalyptic number.

It is an amenable number.

20558620621 is a deficient number, since it is larger than the sum of its proper divisors (5076793907).

20558620621 is a wasteful number, since it uses less digits than its factorization.

20558620621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40512.

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 20558620621 in words is "twenty billion, five hundred fifty-eight million, six hundred twenty thousand, six hundred twenty-one".