20355553240 has 64 divisors (see below), whose sum is σ = 49983363360. Its totient is φ = 7399096320.

The previous prime is 20355553223. The next prime is 20355553261. The reversal of 20355553240 is 4235555302.

It is a junction number, because it is equal to n+sod(n) for n = 20355553196 and 20355553205.

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, 1328664 + ... + 1343896.

Almost surely, 2^20355553240 is an apocalyptic number.

20355553240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20355553240 is an abundant number, since it is smaller than the sum of its proper divisors (29627810120).

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

20355553240 is a wasteful number, since it uses less digits than its factorization.

20355553240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18292 (or 18288 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 34.

The spelling of 20355553240 in words is "twenty billion, three hundred fifty-five million, five hundred fifty-three thousand, two hundred forty".