20632918 has 16 divisors (see below), whose sum is σ = 32431104. Its totient is φ = 9832680.

The previous prime is 20632889. The next prime is 20632919. The reversal of 20632918 is 81923602.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a self number, because there is not a number n which added to its sum of digits gives 20632918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20632919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1671 + ... + 6637.

It is an arithmetic number, because the mean of its divisors is an integer number (2026944).

Almost surely, 2^20632918 is an apocalyptic number.

20632918 is a deficient number, since it is larger than the sum of its proper divisors (11798186).

20632918 is a wasteful number, since it uses less digits than its factorization.

20632918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5067.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 20632918 is about 4542.3471906053. The cubic root of 20632918 is about 274.2754170293.

It can be divided in two parts, 206 and 32918, that added together give a square (33124 = 182²).

The spelling of 20632918 in words is "twenty million, six hundred thirty-two thousand, nine hundred eighteen".