20603333421 has 40 divisors (see below), whose sum is σ = 33617795904. Its totient is φ = 12471252480.

The previous prime is 20603333383. The next prime is 20603333423. The reversal of 20603333421 is 12433330602.

It is a happy number.

20603333421 is a `hidden beast` number, since 2 + 0 + 603 + 3 + 3 + 34 + 21 = 666.

It is not a de Polignac number, because 20603333421 - 2⁶ = 20603333357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20603333423) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 719245 + ... + 747341.

Almost surely, 2^20603333421 is an apocalyptic number.

It is an amenable number.

20603333421 is a deficient number, since it is larger than the sum of its proper divisors (13014462483).

20603333421 is a wasteful number, since it uses less digits than its factorization.

20603333421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28943 (or 28934 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 27.

The spelling of 20603333421 in words is "twenty billion, six hundred three million, three hundred thirty-three thousand, four hundred twenty-one".