20400024001477 has 2 divisors, whose sum is σ = 20400024001478. Its totient is φ = 20400024001476.

The previous prime is 20400024001447. The next prime is 20400024001493. The reversal of 20400024001477 is 77410042000402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12221974048036 + 8178049953441 = 3495994^2 + 2859729^2 .

It is a cyclic number.

It is not a de Polignac number, because 20400024001477 - 2¹⁹ = 20400023477189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20400024001447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200012000738 + 10200012000739.

It is an arithmetic number, because the mean of its divisors is an integer number (10200012000739).

Almost surely, 2^{20400024001477} is an apocalyptic number.

It is an amenable number.

20400024001477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400024001477 is an equidigital number, since it uses as much as digits as its factorization.

20400024001477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 31.

Adding to 20400024001477 its reverse (77410042000402), we get a palindrome (97810066001879).

The spelling of 20400024001477 in words is "twenty trillion, four hundred billion, twenty-four million, one thousand, four hundred seventy-seven".