20212290 has 48 divisors (see below), whose sum is σ = 60061248. Its totient is φ = 4619808.

The previous prime is 20212271. The next prime is 20212319. The reversal of 20212290 is 9221202.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15412 + ... + 16671.

It is an arithmetic number, because the mean of its divisors is an integer number (1251276).

Almost surely, 2^20212290 is an apocalyptic number.

20212290 is an abundant number, since it is smaller than the sum of its proper divisors (39848958).

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

20212290 is a wasteful number, since it uses less digits than its factorization.

20212290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32103 (or 32100 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20212290 is about 4495.8080475038. The cubic root of 20212290 is about 272.3987896729.

Adding to 20212290 its reverse (9221202), we get a palindrome (29433492).

It can be divided in two parts, 20212 and 290, that added together give a palindrome (20502).

The spelling of 20212290 in words is "twenty million, two hundred twelve thousand, two hundred ninety".