20361340 has 24 divisors (see below), whose sum is σ = 43670592. Its totient is φ = 7970880.

The previous prime is 20361337. The next prime is 20361343. The reversal of 20361340 is 4316302.

It is an interprime number because it is at equal distance from previous prime (20361337) and next prime (20361343).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20361343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9891 + ... + 11770.

It is an arithmetic number, because the mean of its divisors is an integer number (1819608).

Almost surely, 2^20361340 is an apocalyptic number.

20361340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20361340 is an abundant number, since it is smaller than the sum of its proper divisors (23309252).

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

20361340 is a wasteful number, since it uses less digits than its factorization.

20361340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21717 (or 21715 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 20361340 is about 4512.3541527677. The cubic root of 20361340 is about 273.0667272833.

Adding to 20361340 its reverse (4316302), we get a palindrome (24677642).

The spelling of 20361340 in words is "twenty million, three hundred sixty-one thousand, three hundred forty".