20723241 has 32 divisors (see below), whose sum is σ = 34679808. Its totient is φ = 10693440.

The previous prime is 20723239. The next prime is 20723249. The reversal of 20723241 is 14232702.

It is not a de Polignac number, because 20723241 - 2¹ = 20723239 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20723249) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65215 + ... + 65531.

It is an arithmetic number, because the mean of its divisors is an integer number (1083744).

Almost surely, 2^20723241 is an apocalyptic number.

20723241 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20723241 is a deficient number, since it is larger than the sum of its proper divisors (13956567).

20723241 is a wasteful number, since it uses less digits than its factorization.

20723241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20723241 is about 4552.2786601877. The cubic root of 20723241 is about 274.6750586231.

Adding to 20723241 its reverse (14232702), we get a palindrome (34955943).

The spelling of 20723241 in words is "twenty million, seven hundred twenty-three thousand, two hundred forty-one".