20346240 has 64 divisors (see below), whose sum is σ = 64859760. Its totient is φ = 5425152.

The previous prime is 20346211. The next prime is 20346247. The reversal of 20346240 is 4264302.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20346247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3379 + ... + 7218.

Almost surely, 2^20346240 is an apocalyptic number.

20346240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20346240 is an abundant number, since it is smaller than the sum of its proper divisors (44513520).

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

20346240 is a wasteful number, since it uses less digits than its factorization.

20346240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10619 (or 10607 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 20346240 is about 4510.6806581712. The cubic root of 20346240 is about 272.9992083596. Note that the first 3 decimals are identical.

The spelling of 20346240 in words is "twenty million, three hundred forty-six thousand, two hundred forty".