20757630 has 16 divisors (see below), whose sum is σ = 49818384. Its totient is φ = 5535360.

The previous prime is 20757613. The next prime is 20757641. The reversal of 20757630 is 3675702.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 691921 = 20757630 / (2 + 0 + 7 + 5 + 7 + 6 + 3 + 0).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 345931 + ... + 345990.

It is an arithmetic number, because the mean of its divisors is an integer number (3113649).

Almost surely, 2^20757630 is an apocalyptic number.

20757630 is an abundant number, since it is smaller than the sum of its proper divisors (29060754).

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

20757630 is a wasteful number, since it uses less digits than its factorization.

20757630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691931.

The product of its (nonzero) digits is 8820, while the sum is 30.

The square root of 20757630 is about 4556.0542139004. The cubic root of 20757630 is about 274.8269103611.

The spelling of 20757630 in words is "twenty million, seven hundred fifty-seven thousand, six hundred thirty".