20723975 has 12 divisors (see below), whose sum is σ = 25775880. Its totient is φ = 16528800.

The previous prime is 20723939. The next prime is 20723999. The reversal of 20723975 is 57932702.

It is not a de Polignac number, because 20723975 - 2¹⁰ = 20722951 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8660 + ... + 10790.

It is an arithmetic number, because the mean of its divisors is an integer number (2147990).

Almost surely, 2^20723975 is an apocalyptic number.

20723975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20723975 is a deficient number, since it is larger than the sum of its proper divisors (5051905).

20723975 is a wasteful number, since it uses less digits than its factorization.

20723975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2530 (or 2525 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 35.

The square root of 20723975 is about 4552.3592784401. The cubic root of 20723975 is about 274.6783015057.

It can be divided in two parts, 207 and 23975, that multiplied together give a triangular number (4962825 = T₃₁₅₀).

The spelling of 20723975 in words is "twenty million, seven hundred twenty-three thousand, nine hundred seventy-five".