20723880 has 64 divisors (see below), whose sum is σ = 62472960. Its totient is φ = 5499648.

The previous prime is 20723869. The next prime is 20723891. The reversal of 20723880 is 8832702.

It is an interprime number because it is at equal distance from previous prime (20723869) and next prime (20723891).

It is a Harshad number since it is a multiple of its sum of digits (30).

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 15 ways as a sum of consecutive naturals, for example, 44529 + ... + 44991.

It is an arithmetic number, because the mean of its divisors is an integer number (976140).

Almost surely, 2^20723880 is an apocalyptic number.

20723880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20723880 is an abundant number, since it is smaller than the sum of its proper divisors (41749080).

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

20723880 is a wasteful number, since it uses less digits than its factorization.

20723880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850 (or 846 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 20723880 is about 4552.3488442781. The cubic root of 20723880 is about 274.6778817909.

The spelling of 20723880 in words is "twenty million, seven hundred twenty-three thousand, eight hundred eighty".