20420902403 has 16 divisors (see below), whose sum is σ = 23456355840. Its totient is φ = 17582493600.

The previous prime is 20420902387. The next prime is 20420902423. The reversal of 20420902403 is 30420902402.

It is not a de Polignac number, because 20420902403 - 2⁴ = 20420902387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20420902423) 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, 881201 + ... + 904077.

It is an arithmetic number, because the mean of its divisors is an integer number (1466022240).

Almost surely, 2^20420902403 is an apocalyptic number.

20420902403 is a deficient number, since it is larger than the sum of its proper divisors (3035453437).

20420902403 is a wasteful number, since it uses less digits than its factorization.

20420902403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27178.

The product of its (nonzero) digits is 3456, while the sum is 26.

Subtracting 20420902403 from its reverse (30420902402), we obtain a palindrome (9999999999).

The spelling of 20420902403 in words is "twenty billion, four hundred twenty million, nine hundred two thousand, four hundred three".