20723025 has 24 divisors (see below), whose sum is σ = 34685280. Its totient is φ = 10915840.

The previous prime is 20722993. The next prime is 20723029. The reversal of 20723025 is 52032702.

It is not a de Polignac number, because 20723025 - 2⁵ = 20722993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20722992 and 20723010.

It is not an unprimeable number, because it can be changed into a prime (20723029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4561 + ... + 7889.

It is an arithmetic number, because the mean of its divisors is an integer number (1445220).

Almost surely, 2^20723025 is an apocalyptic number.

20723025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20723025 is a deficient number, since it is larger than the sum of its proper divisors (13962255).

20723025 is a wasteful number, since it uses less digits than its factorization.

20723025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3425 (or 3420 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 20723025 is about 4552.2549357434. The cubic root of 20723025 is about 274.6741042998.

Adding to 20723025 its reverse (52032702), we get a palindrome (72755727).

It can be divided in two parts, 207 and 23025, that added together give a palindrome (23232).

The spelling of 20723025 in words is "twenty million, seven hundred twenty-three thousand, twenty-five".