20677490 has 16 divisors (see below), whose sum is σ = 37604952. Its totient is φ = 8185344.

The previous prime is 20677477. The next prime is 20677507. The reversal of 20677490 is 9477602.

It can be written as a sum of positive squares in 4 ways, for example, as 20457529 + 219961 = 4523^2 + 469^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20677490.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 9689 + ... + 11628.

Almost surely, 2^20677490 is an apocalyptic number.

20677490 is a deficient number, since it is larger than the sum of its proper divisors (16927462).

20677490 is a wasteful number, since it uses less digits than its factorization.

20677490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21421.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 20677490 is about 4547.2508178019. The cubic root of 20677490 is about 274.4727749837.

It can be divided in two parts, 2067 and 7490, that multiplied together give a triangular number (15481830 = T₅₅₆₄).

The spelling of 20677490 in words is "twenty million, six hundred seventy-seven thousand, four hundred ninety".