20662949 has 2 divisors, whose sum is σ = 20662950. Its totient is φ = 20662948.

The previous prime is 20662931. The next prime is 20662969. The reversal of 20662949 is 94926602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19492225 + 1170724 = 4415^2 + 1082^2 .

It is a cyclic number.

It is not a de Polignac number, because 20662949 - 2⁸ = 20662693 is a prime.

It is a super-2 number, since 2×20662949² = 853914922753202, 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 (20662969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10331474 + 10331475.

It is an arithmetic number, because the mean of its divisors is an integer number (10331475).

Almost surely, 2^20662949 is an apocalyptic number.

It is an amenable number.

20662949 is a deficient number, since it is larger than the sum of its proper divisors (1).

20662949 is an equidigital number, since it uses as much as digits as its factorization.

20662949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 20662949 is about 4545.6516584534. The cubic root of 20662949 is about 274.4084208714.

The spelling of 20662949 in words is "twenty million, six hundred sixty-two thousand, nine hundred forty-nine".