20820215420 has 24 divisors (see below), whose sum is σ = 43739514000. Its totient is φ = 8324836352.

The previous prime is 20820215399. The next prime is 20820215489. The reversal of 20820215420 is 2451202802.

It is a self number, because there is not a number n which added to its sum of digits gives 20820215420.

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, 150245 + ... + 253404.

It is an arithmetic number, because the mean of its divisors is an integer number (1822479750).

Almost surely, 2^20820215420 is an apocalyptic number.

20820215420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20820215420 is an abundant number, since it is smaller than the sum of its proper divisors (22919298580).

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

20820215420 is a wasteful number, since it uses less digits than its factorization.

20820215420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406237 (or 406235 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The spelling of 20820215420 in words is "twenty billion, eight hundred twenty million, two hundred fifteen thousand, four hundred twenty".