20456040 has 64 divisors (see below), whose sum is σ = 66951360. Its totient is φ = 4958720.

The previous prime is 20455979. The next prime is 20456041. The reversal of 20456040 is 4065402.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20455998 and 20456016.

It is not an unprimeable number, because it can be changed into a prime (20456041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6429 + ... + 9068.

It is an arithmetic number, because the mean of its divisors is an integer number (1046115).

Almost surely, 2^20456040 is an apocalyptic number.

20456040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20456040 is an abundant number, since it is smaller than the sum of its proper divisors (46495320).

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

20456040 is a wasteful number, since it uses less digits than its factorization.

20456040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15522 (or 15518 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20456040 is about 4522.8353938652. The cubic root of 20456040 is about 273.4894144586.

The spelling of 20456040 in words is "twenty million, four hundred fifty-six thousand, forty".