20397542 has 8 divisors (see below), whose sum is σ = 33377832. Its totient is φ = 9271600.

The previous prime is 20397529. The next prime is 20397551. The reversal of 20397542 is 24579302.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20397499 and 20397508.

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, 463559 + ... + 463602.

It is an arithmetic number, because the mean of its divisors is an integer number (4172229).

Almost surely, 2^20397542 is an apocalyptic number.

20397542 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20397542 is a deficient number, since it is larger than the sum of its proper divisors (12980290).

20397542 is a wasteful number, since it uses less digits than its factorization.

20397542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927174.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 20397542 is about 4516.3638028839. The cubic root of 20397542 is about 273.2284669440.

The spelling of 20397542 in words is "twenty million, three hundred ninety-seven thousand, five hundred forty-two".