20400228080 has 40 divisors (see below), whose sum is σ = 47442713472. Its totient is φ = 8157995264.

The previous prime is 20400228077. The next prime is 20400228113. The reversal of 20400228080 is 8082200402.

It is a tau number, because it is divible by the number of its divisors (40).

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, 301889 + ... + 363231.

Almost surely, 2^20400228080 is an apocalyptic number.

20400228080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20400228080 is an abundant number, since it is smaller than the sum of its proper divisors (27042485392).

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

20400228080 is a wasteful number, since it uses less digits than its factorization.

20400228080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65513 (or 65507 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 26.

Adding to 20400228080 its reverse (8082200402), we get a palindrome (28482428482).

The spelling of 20400228080 in words is "twenty billion, four hundred million, two hundred twenty-eight thousand, eighty".