20137820 has 12 divisors (see below), whose sum is σ = 42289464. Its totient is φ = 8055120.

The previous prime is 20137787. The next prime is 20137823. The reversal of 20137820 is 2873102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20137823) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 503426 + ... + 503465.

It is an arithmetic number, because the mean of its divisors is an integer number (3524122).

Almost surely, 2^20137820 is an apocalyptic number.

20137820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20137820 is an abundant number, since it is smaller than the sum of its proper divisors (22151644).

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

20137820 is a wasteful number, since it uses less digits than its factorization.

20137820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006900 (or 1006898 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20137820 is about 4487.5182450883. The cubic root of 20137820 is about 272.0638366604.

The spelling of 20137820 in words is "twenty million, one hundred thirty-seven thousand, eight hundred twenty".