20720153 has 2 divisors, whose sum is σ = 20720154. Its totient is φ = 20720152.

The previous prime is 20720131. The next prime is 20720209. The reversal of 20720153 is 35102702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20675209 + 44944 = 4547^2 + 212^2 .

It is a cyclic number.

It is not a de Polignac number, because 20720153 - 2¹⁶ = 20654617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20720113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10360076 + 10360077.

It is an arithmetic number, because the mean of its divisors is an integer number (10360077).

Almost surely, 2^20720153 is an apocalyptic number.

It is an amenable number.

20720153 is a deficient number, since it is larger than the sum of its proper divisors (1).

20720153 is an equidigital number, since it uses as much as digits as its factorization.

20720153 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 20720153 is about 4551.9394767505. The cubic root of 20720153 is about 274.6614147033.

Adding to 20720153 its reverse (35102702), we get a palindrome (55822855).

The spelling of 20720153 in words is "twenty million, seven hundred twenty thousand, one hundred fifty-three".