20353523440 has 40 divisors (see below), whose sum is σ = 47362848048. Its totient is φ = 8134371840.

The previous prime is 20353523413. The next prime is 20353523461. The reversal of 20353523440 is 4432535302.

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, 16341 + ... + 202420.

Almost surely, 2^20353523440 is an apocalyptic number.

20353523440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20353523440 is an abundant number, since it is smaller than the sum of its proper divisors (27009324608).

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

20353523440 is a wasteful number, since it uses less digits than its factorization.

20353523440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219937 (or 219931 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 31.

The spelling of 20353523440 in words is "twenty billion, three hundred fifty-three million, five hundred twenty-three thousand, four hundred forty".