20634357505 has 8 divisors (see below), whose sum is σ = 24763362624. Its totient is φ = 16506063600.

The previous prime is 20634357439. The next prime is 20634357551. The reversal of 20634357505 is 50575343602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20634357505 - 2⁷ = 20634357377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111741 + ... + 231850.

It is an arithmetic number, because the mean of its divisors is an integer number (3095420328).

Almost surely, 2^20634357505 is an apocalyptic number.

It is an amenable number.

20634357505 is a deficient number, since it is larger than the sum of its proper divisors (4129005119).

20634357505 is a wasteful number, since it uses less digits than its factorization.

20634357505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355607.

The product of its (nonzero) digits is 378000, while the sum is 40.

The spelling of 20634357505 in words is "twenty billion, six hundred thirty-four million, three hundred fifty-seven thousand, five hundred five".