400010020 has 24 divisors (see below), whose sum is σ = 876544704. Its totient is φ = 153047136.

The previous prime is 400009999. The next prime is 400010057. The reversal of 400010020 is 20010004.

It is a super-2 number, since 2×400010020² = 320016032200800800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 400009985 and 400010012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 434334 + ... + 435253.

It is an arithmetic number, because the mean of its divisors is an integer number (36522696).

Almost surely, 2^400010020 is an apocalyptic number.

It is an amenable number.

400010020 is an abundant number, since it is smaller than the sum of its proper divisors (476534684).

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

400010020 is a wasteful number, since it uses less digits than its factorization.

400010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869619 (or 869617 counting only the distinct ones).

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

The square root of 400010020 is about 20000.2504984313. The cubic root of 400010020 is about 736.8124520093.

Adding to 400010020 its reverse (20010004), we get a palindrome (420020024).

The spelling of 400010020 in words is "four hundred million, ten thousand, twenty".