20948724 has 18 divisors (see below), whose sum is σ = 52953810. Its totient is φ = 6982896.

The previous prime is 20948723. The next prime is 20948729. The reversal of 20948724 is 42784902.

It can be written as a sum of positive squares in only one way, i.e., 17489124 + 3459600 = 4182^2 + 1860^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 581909 = 20948724 / (2 + 0 + 9 + 4 + 8 + 7 + 2 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20948723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 290919 + ... + 290990.

Almost surely, 2^20948724 is an apocalyptic number.

It is an amenable number.

20948724 is an abundant number, since it is smaller than the sum of its proper divisors (32005086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20948724 is a wasteful number, since it uses less digits than its factorization.

20948724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581919 (or 581914 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 20948724 is about 4576.9776053636. The cubic root of 20948724 is about 275.6676844749.

The spelling of 20948724 in words is "twenty million, nine hundred forty-eight thousand, seven hundred twenty-four".