20630650501 has 4 divisors (see below), whose sum is σ = 20632027500. Its totient is φ = 20629273504.

The previous prime is 20630650493. The next prime is 20630650597. The reversal of 20630650501 is 10505603602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18249308100 + 2381342401 = 135090^2 + 48799^2 .

It is a cyclic number.

It is not a de Polignac number, because 20630650501 - 2³ = 20630650493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20630650501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20630651501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 665776 + ... + 696073.

It is an arithmetic number, because the mean of its divisors is an integer number (5158006875).

Almost surely, 2^20630650501 is an apocalyptic number.

It is an amenable number.

20630650501 is a deficient number, since it is larger than the sum of its proper divisors (1376999).

20630650501 is a wasteful number, since it uses less digits than its factorization.

20630650501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376998.

The product of its (nonzero) digits is 5400, while the sum is 28.

The spelling of 20630650501 in words is "twenty billion, six hundred thirty million, six hundred fifty thousand, five hundred one".