20910550505 has 8 divisors (see below), whose sum is σ = 27022865352. Its totient is φ = 15441637248.

The previous prime is 20910550489. The next prime is 20910550541. The reversal of 20910550505 is 50505501902.

It can be written as a sum of positive squares in 4 ways, for example, as 274366096 + 20636184409 = 16564^2 + 143653^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20910550505 - 2⁴ = 20910550489 is a prime.

It is a super-2 number, since 2×20910550505² (a number of 21 digits) contains 22 as substring.

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, 160850324 + ... + 160850453.

It is an arithmetic number, because the mean of its divisors is an integer number (3377858169).

Almost surely, 2^20910550505 is an apocalyptic number.

It is an amenable number.

20910550505 is a deficient number, since it is larger than the sum of its proper divisors (6112314847).

20910550505 is a wasteful number, since it uses less digits than its factorization.

20910550505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321700795.

The product of its (nonzero) digits is 11250, while the sum is 32.

The spelling of 20910550505 in words is "twenty billion, nine hundred ten million, five hundred fifty thousand, five hundred five".