20700820 has 24 divisors (see below), whose sum is σ = 49682304. Its totient is φ = 7097376.

The previous prime is 20700817. The next prime is 20700833. The reversal of 20700820 is 2800702.

It is a congruent number.

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, 73792 + ... + 74071.

It is an arithmetic number, because the mean of its divisors is an integer number (2070096).

Almost surely, 2^20700820 is an apocalyptic number.

20700820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20700820 is an abundant number, since it is smaller than the sum of its proper divisors (28981484).

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

20700820 is a wasteful number, since it uses less digits than its factorization.

20700820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147879 (or 147877 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 20700820 is about 4549.8153808699. The cubic root of 20700820 is about 274.5759635727.

The spelling of 20700820 in words is "twenty million, seven hundred thousand, eight hundred twenty".