20755715 has 8 divisors (see below), whose sum is σ = 24932880. Its totient is φ = 16587232.

The previous prime is 20755711. The next prime is 20755741. The reversal of 20755715 is 51755702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20755715 - 2² = 20755711 is a prime.

It is a super-2 number, since 2×20755715² = 861599410322450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20755711) 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, 5681 + ... + 8589.

It is an arithmetic number, because the mean of its divisors is an integer number (3116610).

Almost surely, 2^20755715 is an apocalyptic number.

20755715 is a deficient number, since it is larger than the sum of its proper divisors (4177165).

20755715 is a wasteful number, since it uses less digits than its factorization.

20755715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4341.

The product of its (nonzero) digits is 12250, while the sum is 32.

The square root of 20755715 is about 4555.8440491307. The cubic root of 20755715 is about 274.8184586942.

The spelling of 20755715 in words is "twenty million, seven hundred fifty-five thousand, seven hundred fifteen".