20066820 has 24 divisors (see below), whose sum is σ = 56187264. Its totient is φ = 5351136.

The previous prime is 20066819. The next prime is 20066821. The reversal of 20066820 is 2866002.

It is an interprime number because it is at equal distance from previous prime (20066819) and next prime (20066821).

It is not an unprimeable number, because it can be changed into a prime (20066821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167164 + ... + 167283.

It is an arithmetic number, because the mean of its divisors is an integer number (2341136).

Almost surely, 2^20066820 is an apocalyptic number.

20066820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20066820 is an abundant number, since it is smaller than the sum of its proper divisors (36120444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20066820 is a wasteful number, since it uses less digits than its factorization.

20066820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334459 (or 334457 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 20066820 is about 4479.6004286097. The cubic root of 20066820 is about 271.7437212683.

The spelling of 20066820 in words is "twenty million, sixty-six thousand, eight hundred twenty".