20553115440 has 160 divisors (see below), whose sum is σ = 74853709056. Its totient is φ = 4599290880.

The previous prime is 20553115433. The next prime is 20553115469. The reversal of 20553115440 is 4451135502.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20553115398 and 20553115407.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 265114 + ... + 333753.

Almost surely, 2^20553115440 is an apocalyptic number.

20553115440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20553115440 is an abundant number, since it is smaller than the sum of its proper divisors (54300593616).

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

20553115440 is a wasteful number, since it uses less digits than its factorization.

20553115440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598907 (or 598901 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The spelling of 20553115440 in words is "twenty billion, five hundred fifty-three million, one hundred fifteen thousand, four hundred forty".