20507982 has 16 divisors (see below), whose sum is σ = 44744832. Its totient is φ = 6214520.

The previous prime is 20507969. The next prime is 20507983. The reversal of 20507982 is 28970502.

It is a super-3 number, since 3×20507982³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20507983) 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, 155298 + ... + 155429.

It is an arithmetic number, because the mean of its divisors is an integer number (2796552).

Almost surely, 2^20507982 is an apocalyptic number.

20507982 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20507982 is an abundant number, since it is smaller than the sum of its proper divisors (24236850).

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

20507982 is a wasteful number, since it uses less digits than its factorization.

20507982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310743.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 20507982 is about 4528.5739477235. The cubic root of 20507982 is about 273.7207003524.

The spelling of 20507982 in words is "twenty million, five hundred seven thousand, nine hundred eighty-two".