20540629 has 2 divisors, whose sum is σ = 20540630. Its totient is φ = 20540628.

The previous prime is 20540609. The next prime is 20540647. The reversal of 20540629 is 92604502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20007729 + 532900 = 4473^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 20540629 - 2¹³ = 20532437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20540597 and 20540606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20540609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10270314 + 10270315.

It is an arithmetic number, because the mean of its divisors is an integer number (10270315).

Almost surely, 2^20540629 is an apocalyptic number.

It is an amenable number.

20540629 is a deficient number, since it is larger than the sum of its proper divisors (1).

20540629 is an equidigital number, since it uses as much as digits as its factorization.

20540629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20540629 is about 4532.1770706803. The cubic root of 20540629 is about 273.8658702025.

The spelling of 20540629 in words is "twenty million, five hundred forty thousand, six hundred twenty-nine".