20018812 has 12 divisors (see below), whose sum is σ = 38217816. Its totient is φ = 9099440.

The previous prime is 20018807. The next prime is 20018819. The reversal of 20018812 is 21881002.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20018819) 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, 227443 + ... + 227530.

It is an arithmetic number, because the mean of its divisors is an integer number (3184818).

Almost surely, 2^20018812 is an apocalyptic number.

20018812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20018812 is a deficient number, since it is larger than the sum of its proper divisors (18199004).

20018812 is a wasteful number, since it uses less digits than its factorization.

20018812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454988 (or 454986 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 20018812 is about 4474.2387061935. The cubic root of 20018812 is about 271.5268410302.

Adding to 20018812 its reverse (21881002), we get a palindrome (41899814).

The spelling of 20018812 in words is "twenty million, eighteen thousand, eight hundred twelve".