20725767 has 16 divisors (see below), whose sum is σ = 30881760. Its totient is φ = 13737600.

The previous prime is 20725753. The next prime is 20725769. The reversal of 20725767 is 76752702.

It is not a de Polignac number, because 20725767 - 2¹⁶ = 20660231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20725769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2767 + ... + 7007.

It is an arithmetic number, because the mean of its divisors is an integer number (1930110).

Almost surely, 2^20725767 is an apocalyptic number.

20725767 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20725767 is a deficient number, since it is larger than the sum of its proper divisors (10155993).

20725767 is a wasteful number, since it uses less digits than its factorization.

20725767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4431 (or 4425 counting only the distinct ones).

The product of its (nonzero) digits is 41160, while the sum is 36.

The square root of 20725767 is about 4552.5560952063. The cubic root of 20725767 is about 274.6862184124.

The spelling of 20725767 in words is "twenty million, seven hundred twenty-five thousand, seven hundred sixty-seven".