20661074 has 16 divisors (see below), whose sum is σ = 35529408. Its totient is φ = 8827152.

The previous prime is 20661049. The next prime is 20661101. The reversal of 20661074 is 47016602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2732 + ... + 6984.

It is an arithmetic number, because the mean of its divisors is an integer number (2220588).

Almost surely, 2^20661074 is an apocalyptic number.

20661074 is a deficient number, since it is larger than the sum of its proper divisors (14868334).

20661074 is a wasteful number, since it uses less digits than its factorization.

20661074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4609.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20661074 is about 4545.4454127181. The cubic root of 20661074 is about 274.4001204855.

Adding to 20661074 its reverse (47016602), we get a palindrome (67677676).

The spelling of 20661074 in words is "twenty million, six hundred sixty-one thousand, seventy-four".