20148641 has 2 divisors, whose sum is σ = 20148642. Its totient is φ = 20148640.

The previous prime is 20148631. The next prime is 20148643. The reversal of 20148641 is 14684102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19140625 + 1008016 = 4375^2 + 1004^2 .

It is a cyclic number.

It is not a de Polignac number, because 20148641 - 2¹⁸ = 19886497 is a prime.

Together with 20148643, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20148641.

It is not a weakly prime, because it can be changed into another prime (20148643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10074320 + 10074321.

It is an arithmetic number, because the mean of its divisors is an integer number (10074321).

Almost surely, 2^20148641 is an apocalyptic number.

It is an amenable number.

20148641 is a deficient number, since it is larger than the sum of its proper divisors (1).

20148641 is an equidigital number, since it uses as much as digits as its factorization.

20148641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 20148641 is about 4488.7237607142. The cubic root of 20148641 is about 272.1125588428.

The spelling of 20148641 in words is "twenty million, one hundred forty-eight thousand, six hundred forty-one".