20011206158420 has 48 divisors (see below), whose sum is σ = 42168858551568. Its totient is φ = 7976803860480.

The previous prime is 20011206158413. The next prime is 20011206158423. The reversal of 20011206158420 is 2485160211002.

It can be written as a sum of positive squares in 8 ways, for example, as 559701489424 + 19451504668996 = 748132^2 + 4410386^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011206158423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157459142 + ... + 157586178.

It is an arithmetic number, because the mean of its divisors is an integer number (878517886491).

Almost surely, 2^{20011206158420} is an apocalyptic number.

20011206158420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011206158420 is an abundant number, since it is smaller than the sum of its proper divisors (22157652393148).

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

20011206158420 is a wasteful number, since it uses less digits than its factorization.

20011206158420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154220 (or 154218 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

Adding to 20011206158420 its reverse (2485160211002), we get a palindrome (22496366369422).

The spelling of 20011206158420 in words is "twenty trillion, eleven billion, two hundred six million, one hundred fifty-eight thousand, four hundred twenty".