20157724 has 12 divisors (see below), whose sum is σ = 35325864. Its totient is φ = 10064624.

The previous prime is 20157707. The next prime is 20157737. The reversal of 20157724 is 42775102.

It is a junction number, because it is equal to n+sod(n) for n = 20157692 and 20157701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27 + ... + 6349.

It is an arithmetic number, because the mean of its divisors is an integer number (2943822).

Almost surely, 2^20157724 is an apocalyptic number.

It is an amenable number.

20157724 is a deficient number, since it is larger than the sum of its proper divisors (15168140).

20157724 is a wasteful number, since it uses less digits than its factorization.

20157724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7124 (or 7122 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 20157724 is about 4489.7354042304. The cubic root of 20157724 is about 272.1534421140.

It can be divided in two parts, 201577 and 24, that added together give a square (201601 = 449²).

The spelling of 20157724 in words is "twenty million, one hundred fifty-seven thousand, seven hundred twenty-four".