20602646040 has 64 divisors (see below), whose sum is σ = 61837630560. Its totient is φ = 5491399680.

The previous prime is 20602645969. The next prime is 20602646041. The reversal of 20602646040 is 4064620602.

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 = 20602645989 and 20602646007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20602646041) 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, 216270 + ... + 296610.

Almost surely, 2^20602646040 is an apocalyptic number.

20602646040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20602646040 is an abundant number, since it is smaller than the sum of its proper divisors (41234984520).

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

20602646040 is a wasteful number, since it uses less digits than its factorization.

20602646040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82492 (or 82488 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The spelling of 20602646040 in words is "twenty billion, six hundred two million, six hundred forty-six thousand, forty".