20246665 has 8 divisors (see below), whose sum is σ = 24423048. Its totient is φ = 16112640.

The previous prime is 20246657. The next prime is 20246683. The reversal of 20246665 is 56664202.

It can be written as a sum of positive squares in 4 ways, for example, as 719104 + 19527561 = 848^2 + 4419^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20246665 - 2³ = 20246657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9526 + ... + 11455.

It is an arithmetic number, because the mean of its divisors is an integer number (3052881).

Almost surely, 2^20246665 is an apocalyptic number.

It is an amenable number.

20246665 is a deficient number, since it is larger than the sum of its proper divisors (4176383).

20246665 is a wasteful number, since it uses less digits than its factorization.

20246665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21179.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 20246665 is about 4499.6294291864. The cubic root of 20246665 is about 272.5531249004.

The spelling of 20246665 in words is "twenty million, two hundred forty-six thousand, six hundred sixty-five".