20352780 has 144 divisors (see below), whose sum is σ = 73120320. Its totient is φ = 4483584.

The previous prime is 20352767. The next prime is 20352793. The reversal of 20352780 is 8725302.

It is an interprime number because it is at equal distance from previous prime (20352767) and next prime (20352793).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36262 + ... + 36818.

It is an arithmetic number, because the mean of its divisors is an integer number (507780).

Almost surely, 2^20352780 is an apocalyptic number.

20352780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20352780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36560160).

20352780 is an abundant number, since it is smaller than the sum of its proper divisors (52767540).

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

20352780 is a wasteful number, since it uses less digits than its factorization.

20352780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608 (or 603 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20352780 is about 4511.4055459469. The cubic root of 20352780 is about 273.0284557546.

The spelling of 20352780 in words is "twenty million, three hundred fifty-two thousand, seven hundred eighty".