20401333457 has 2 divisors, whose sum is σ = 20401333458. Its totient is φ = 20401333456.

The previous prime is 20401333417. The next prime is 20401333471. The reversal of 20401333457 is 75433310402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14458619536 + 5942713921 = 120244^2 + 77089^2 .

It is a cyclic number.

It is not a de Polignac number, because 20401333457 - 2¹⁴ = 20401317073 is a prime.

It is not a weakly prime, because it can be changed into another prime (20401333417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200666728 + 10200666729.

It is an arithmetic number, because the mean of its divisors is an integer number (10200666729).

Almost surely, 2^20401333457 is an apocalyptic number.

It is an amenable number.

20401333457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401333457 is an equidigital number, since it uses as much as digits as its factorization.

20401333457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 32.

Adding to 20401333457 its reverse (75433310402), we get a palindrome (95834643859).

The spelling of 20401333457 in words is "twenty billion, four hundred one million, three hundred thirty-three thousand, four hundred fifty-seven".