20634148658 has 6 divisors (see below), whose sum is σ = 30951527709. Its totient is φ = 10316972756.

The previous prime is 20634148651. The next prime is 20634148709. The reversal of 20634148658 is 85684143602.

It can be written as a sum of positive squares in 2 ways, for example, as 20558684689 + 75463969 = 143383^2 + 8687^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=101573.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20634148651) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 152360 + ... + 253932.

Almost surely, 2^20634148658 is an apocalyptic number.

20634148658 is a deficient number, since it is larger than the sum of its proper divisors (10317379051).

20634148658 is an frugal number, since it uses more digits than its factorization.

20634148658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203148 (or 101575 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 47.

The spelling of 20634148658 in words is "twenty billion, six hundred thirty-four million, one hundred forty-eight thousand, six hundred fifty-eight".