20558951188 has 6 divisors (see below), whose sum is σ = 35978164586. Its totient is φ = 10279475592.

The previous prime is 20558951177. The next prime is 20558951191. The reversal of 20558951188 is 88115985502.

It can be written as a sum of positive squares in only one way, i.e., 20491349904 + 67601284 = 143148^2 + 8222^2 .

It is a super-2 number, since 2×20558951188² (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 as a sum of consecutive naturals, namely, 2569868895 + ... + 2569868902.

Almost surely, 2^20558951188 is an apocalyptic number.

It is an amenable number.

20558951188 is a deficient number, since it is larger than the sum of its proper divisors (15419213398).

20558951188 is a wasteful number, since it uses less digits than its factorization.

20558951188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5139737801 (or 5139737799 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 52.

The spelling of 20558951188 in words is "twenty billion, five hundred fifty-eight million, nine hundred fifty-one thousand, one hundred eighty-eight".