20404213020 has 72 divisors (see below), whose sum is σ = 63889338240. Its totient is φ = 5265601920.

The previous prime is 20404213019. The next prime is 20404213061. The reversal of 20404213020 is 2031240402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20404212984 and 20404213002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1822755 + ... + 1833914.

It is an arithmetic number, because the mean of its divisors is an integer number (887351920).

Almost surely, 2^20404213020 is an apocalyptic number.

20404213020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20404213020 is an abundant number, since it is smaller than the sum of its proper divisors (43485125220).

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

20404213020 is a wasteful number, since it uses less digits than its factorization.

20404213020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3656715 (or 3656710 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 20404213020 its reverse (2031240402), we get a palindrome (22435453422).

The spelling of 20404213020 in words is "twenty billion, four hundred four million, two hundred thirteen thousand, twenty".