20755020 has 192 divisors, whose sum is σ = 71124480. Its totient is φ = 4454400.

The previous prime is 20755019. The next prime is 20755037. The reversal of 20755020 is 2055702.

20755020 = 501² + 502² + ... + 572².

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 351751 + ... + 351809.

It is an arithmetic number, because the mean of its divisors is an integer number (370440).

Almost surely, 2^20755020 is an apocalyptic number.

20755020 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 20755020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35562240).

20755020 is an abundant number, since it is smaller than the sum of its proper divisors (50369460).

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

20755020 is a wasteful number, since it uses less digits than its factorization.

20755020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 21.

The square root of 20755020 is about 4555.7677728348. The cubic root of 20755020 is about 274.8153912506.

The spelling of 20755020 in words is "twenty million, seven hundred fifty-five thousand, twenty".