20145256403 has 2 divisors, whose sum is σ = 20145256404. Its totient is φ = 20145256402.

The previous prime is 20145256361. The next prime is 20145256451. The reversal of 20145256403 is 30465254102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20145256403 - 2¹² = 20145252307 is a prime.

It is a super-2 number, since 2×20145256403² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20145256403.

It is not a weakly prime, because it can be changed into another prime (20145256303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10072628201 + 10072628202.

It is an arithmetic number, because the mean of its divisors is an integer number (10072628202).

Almost surely, 2^20145256403 is an apocalyptic number.

20145256403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20145256403 is an equidigital number, since it uses as much as digits as its factorization.

20145256403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 32.

The spelling of 20145256403 in words is "twenty billion, one hundred forty-five million, two hundred fifty-six thousand, four hundred three".