20402153 has 2 divisors, whose sum is σ = 20402154. Its totient is φ = 20402152.

The previous prime is 20402149. The next prime is 20402189. The reversal of 20402153 is 35120402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20322064 + 80089 = 4508^2 + 283^2 .

It is a cyclic number.

It is not a de Polignac number, because 20402153 - 2² = 20402149 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20405153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201076 + 10201077.

It is an arithmetic number, because the mean of its divisors is an integer number (10201077).

Almost surely, 2^20402153 is an apocalyptic number.

It is an amenable number.

20402153 is a deficient number, since it is larger than the sum of its proper divisors (1).

20402153 is an equidigital number, since it uses as much as digits as its factorization.

20402153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20402153 is about 4516.8742510723. The cubic root of 20402153 is about 273.2490537634.

Adding to 20402153 its reverse (35120402), we get a palindrome (55522555).

The spelling of 20402153 in words is "twenty million, four hundred two thousand, one hundred fifty-three".