20420400224220 has 48 divisors (see below), whose sum is σ = 57496545912960. Its totient is φ = 5415018604096.

The previous prime is 20420400224171. The next prime is 20420400224267. The reversal of 20420400224220 is 2242200402402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 950659662 + ... + 950681141.

It is an arithmetic number, because the mean of its divisors is an integer number (1197844706520).

Almost surely, 2^{20420400224220} is an apocalyptic number.

20420400224220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20420400224220 is an abundant number, since it is smaller than the sum of its proper divisors (37076145688740).

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

20420400224220 is a wasteful number, since it uses less digits than its factorization.

20420400224220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901340994 (or 1901340992 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 24.

Adding to 20420400224220 its reverse (2242200402402), we get a palindrome (22662600626622).

The spelling of 20420400224220 in words is "twenty trillion, four hundred twenty billion, four hundred million, two hundred twenty-four thousand, two hundred twenty".