10400020 has 24 divisors (see below), whose sum is σ = 21919968. Its totient is φ = 4144800.

The previous prime is 10399993. The next prime is 10400021. The reversal of 10400020 is 2000401.

It is a junction number, because it is equal to n+sod(n) for n = 10399976 and 10400012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10400021) 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, 5835 + ... + 7405.

It is an arithmetic number, because the mean of its divisors is an integer number (913332).

Almost surely, 2^10400020 is an apocalyptic number.

10400020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10400020 is an abundant number, since it is smaller than the sum of its proper divisors (11519948).

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

10400020 is a wasteful number, since it uses less digits than its factorization.

10400020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911 (or 1909 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 10400020 is about 3224.9062001863. The cubic root of 10400020 is about 218.2787165343.

Adding to 10400020 its reverse (2000401), we get a palindrome (12400421).

The spelling of 10400020 in words is "ten million, four hundred thousand, twenty".