20394749403 has 16 divisors (see below), whose sum is σ = 34530792960. Its totient is φ = 11654142408.

The previous prime is 20394749399. The next prime is 20394749411. The reversal of 20394749403 is 30494749302.

It is not a de Polignac number, because 20394749403 - 2² = 20394749399 is a prime.

It is a super-2 number, since 2×20394749403² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20394749423) 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, 53954175 + ... + 53954552.

It is an arithmetic number, because the mean of its divisors is an integer number (2158174560).

Almost surely, 2^20394749403 is an apocalyptic number.

20394749403 is a deficient number, since it is larger than the sum of its proper divisors (14136043557).

20394749403 is a wasteful number, since it uses less digits than its factorization.

20394749403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107908743 (or 107908737 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 45.

The spelling of 20394749403 in words is "twenty billion, three hundred ninety-four million, seven hundred forty-nine thousand, four hundred three".