20655161040 has 80 divisors (see below), whose sum is σ = 66814973568. Its totient is φ = 5268561408.

The previous prime is 20655161039. The next prime is 20655161047. The reversal of 20655161040 is 4016155602.

It is a tau number, because it is divible by the number of its divisors (80).

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 = 20655160989 and 20655161007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655161047) 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, 1865419 + ... + 1876458.

Almost surely, 2^20655161040 is an apocalyptic number.

20655161040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20655161040 is an abundant number, since it is smaller than the sum of its proper divisors (46159812528).

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

20655161040 is a wasteful number, since it uses less digits than its factorization.

20655161040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3741916 (or 3741910 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 20655161040 in words is "twenty billion, six hundred fifty-five million, one hundred sixty-one thousand, forty".