20545402153 has 2 divisors, whose sum is σ = 20545402154. Its totient is φ = 20545402152.

The previous prime is 20545402133. The next prime is 20545402159. The reversal of 20545402153 is 35120454502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19848019689 + 697382464 = 140883^2 + 26408^2 .

It is a cyclic number.

It is not a de Polignac number, because 20545402153 - 2¹⁷ = 20545271081 is a prime.

It is a super-2 number, since 2×20545402153² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20545402159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10272701076 + 10272701077.

It is an arithmetic number, because the mean of its divisors is an integer number (10272701077).

Almost surely, 2^20545402153 is an apocalyptic number.

It is an amenable number.

20545402153 is a deficient number, since it is larger than the sum of its proper divisors (1).

20545402153 is an equidigital number, since it uses as much as digits as its factorization.

20545402153 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24000, while the sum is 31.

Adding to 20545402153 its reverse (35120454502), we get a palindrome (55665856655).

The spelling of 20545402153 in words is "twenty billion, five hundred forty-five million, four hundred two thousand, one hundred fifty-three".