20229140 has 24 divisors (see below), whose sum is σ = 42602280. Its totient is φ = 8068608.

The previous prime is 20229119. The next prime is 20229161. The reversal of 20229140 is 4192202.

It is an interprime number because it is at equal distance from previous prime (20229119) and next prime (20229161).

It can be written as a sum of positive squares in 4 ways, for example, as 8271376 + 11957764 = 2876^2 + 3458^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6944 + ... + 9416.

It is an arithmetic number, because the mean of its divisors is an integer number (1775095).

Almost surely, 2^20229140 is an apocalyptic number.

20229140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20229140 is an abundant number, since it is smaller than the sum of its proper divisors (22373140).

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

20229140 is a wasteful number, since it uses less digits than its factorization.

20229140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2891 (or 2889 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20229140 is about 4497.6816250153. The cubic root of 20229140 is about 272.4744638417.

The spelling of 20229140 in words is "twenty million, two hundred twenty-nine thousand, one hundred forty".