20668570 has 32 divisors (see below), whose sum is σ = 41157648. Its totient is φ = 7423488.

The previous prime is 20668567. The next prime is 20668573. The reversal of 20668570 is 7586602.

It is an interprime number because it is at equal distance from previous prime (20668567) and next prime (20668573).

It can be written as a sum of positive squares in 8 ways, for example, as 9903609 + 10764961 = 3147^2 + 3281^2 .

It is not an unprimeable number, because it can be changed into a prime (20668573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2662 + ... + 6958.

Almost surely, 2^20668570 is an apocalyptic number.

20668570 is a deficient number, since it is larger than the sum of its proper divisors (20489078).

20668570 is a wasteful number, since it uses less digits than its factorization.

20668570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4354.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 20668570 is about 4546.2698995990. The cubic root of 20668570 is about 274.4333013130.

The spelling of 20668570 in words is "twenty million, six hundred sixty-eight thousand, five hundred seventy".