20755631 has 8 divisors (see below), whose sum is σ = 22956864. Its totient is φ = 18640800.

The previous prime is 20755613. The next prime is 20755649. The reversal of 20755631 is 13655702.

It is an interprime number because it is at equal distance from previous prime (20755613) and next prime (20755649).

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 20755631 - 2²² = 16561327 is a prime.

It is a super-2 number, since 2×20755631² = 861592436416322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20755594 and 20755603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20755661) 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, 21095 + ... + 22056.

It is an arithmetic number, because the mean of its divisors is an integer number (2869608).

Almost surely, 2^20755631 is an apocalyptic number.

20755631 is a deficient number, since it is larger than the sum of its proper divisors (2201233).

20755631 is a wasteful number, since it uses less digits than its factorization.

20755631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43201.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 20755631 is about 4555.8348301930. The cubic root of 20755631 is about 274.8180879565.

The spelling of 20755631 in words is "twenty million, seven hundred fifty-five thousand, six hundred thirty-one".