20400025403 has 2 divisors, whose sum is σ = 20400025404. Its totient is φ = 20400025402.

The previous prime is 20400025391. The next prime is 20400025427. The reversal of 20400025403 is 30452000402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20400025403 - 2²⁴ = 20383248187 is a prime.

It is a super-2 number, since 2×20400025403² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20400025433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200012701 + 10200012702.

It is an arithmetic number, because the mean of its divisors is an integer number (10200012702).

Almost surely, 2^20400025403 is an apocalyptic number.

20400025403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400025403 is an equidigital number, since it uses as much as digits as its factorization.

20400025403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 20.

Adding to 20400025403 its reverse (30452000402), we get a palindrome (50852025805).

The spelling of 20400025403 in words is "twenty billion, four hundred million, twenty-five thousand, four hundred three".