20513106 has 24 divisors (see below), whose sum is σ = 44550480. Its totient is φ = 6821496.

The previous prime is 20513093. The next prime is 20513113. The reversal of 20513106 is 60131502.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8325 + ... + 10503.

It is an arithmetic number, because the mean of its divisors is an integer number (1856270).

Almost surely, 2^20513106 is an apocalyptic number.

20513106 is an abundant number, since it is smaller than the sum of its proper divisors (24037374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20513106 is a wasteful number, since it uses less digits than its factorization.

20513106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2710 (or 2707 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 20513106 is about 4529.1396534000. The cubic root of 20513106 is about 273.7434951854.

Adding to 20513106 its reverse (60131502), we get a palindrome (80644608).

The spelling of 20513106 in words is "twenty million, five hundred thirteen thousand, one hundred six".