20456340 has 24 divisors (see below), whose sum is σ = 57277920. Its totient is φ = 5455008.

The previous prime is 20456333. The next prime is 20456353. The reversal of 20456340 is 4365402.

It is a self number, because there is not a number n which added to its sum of digits gives 20456340.

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, 170410 + ... + 170529.

It is an arithmetic number, because the mean of its divisors is an integer number (2386580).

Almost surely, 2^20456340 is an apocalyptic number.

20456340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20456340 is an abundant number, since it is smaller than the sum of its proper divisors (36821580).

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

20456340 is a wasteful number, since it uses less digits than its factorization.

20456340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340951 (or 340949 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 20456340 is about 4522.8685587799. The cubic root of 20456340 is about 273.4907514138.

It can be divided in two parts, 2045 and 6340, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 20456340 in words is "twenty million, four hundred fifty-six thousand, three hundred forty".