20400403601 has 2 divisors, whose sum is σ = 20400403602. Its totient is φ = 20400403600.

The previous prime is 20400403591. The next prime is 20400403619. The reversal of 20400403601 is 10630400402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13865298001 + 6535105600 = 117751^2 + 80840^2 .

It is a cyclic number.

It is not a de Polignac number, because 20400403601 - 2⁶ = 20400403537 is a prime.

It is not a weakly prime, because it can be changed into another prime (20400403651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200201800 + 10200201801.

It is an arithmetic number, because the mean of its divisors is an integer number (10200201801).

Almost surely, 2^20400403601 is an apocalyptic number.

It is an amenable number.

20400403601 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400403601 is an equidigital number, since it uses as much as digits as its factorization.

20400403601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

The spelling of 20400403601 in words is "twenty billion, four hundred million, four hundred three thousand, six hundred one".