20603011640 has 16 divisors (see below), whose sum is σ = 46356776280. Its totient is φ = 8241204640.

The previous prime is 20603011601. The next prime is 20603011643. The reversal of 20603011640 is 4611030602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20603011643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257537606 + ... + 257537685.

Almost surely, 2^20603011640 is an apocalyptic number.

20603011640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20603011640 is an abundant number, since it is smaller than the sum of its proper divisors (25753764640).

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

20603011640 is a wasteful number, since it uses less digits than its factorization.

20603011640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515075302 (or 515075298 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The spelling of 20603011640 in words is "twenty billion, six hundred three million, eleven thousand, six hundred forty".