20621141 has 2 divisors, whose sum is σ = 20621142. Its totient is φ = 20621140.

The previous prime is 20621131. The next prime is 20621171. The reversal of 20621141 is 14112602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20160100 + 461041 = 4490^2 + 679^2 .

It is a cyclic number.

It is not a de Polignac number, because 20621141 - 2⁶ = 20621077 is a prime.

It is a super-2 number, since 2×20621141² = 850462912283762, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20621131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10310570 + 10310571.

It is an arithmetic number, because the mean of its divisors is an integer number (10310571).

Almost surely, 2^20621141 is an apocalyptic number.

It is an amenable number.

20621141 is a deficient number, since it is larger than the sum of its proper divisors (1).

20621141 is an equidigital number, since it uses as much as digits as its factorization.

20621141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 20621141 is about 4541.0506493542. The cubic root of 20621141 is about 274.2232228227.

Adding to 20621141 its reverse (14112602), we get a palindrome (34733743).

The spelling of 20621141 in words is "twenty million, six hundred twenty-one thousand, one hundred forty-one".