20472538 has 8 divisors (see below), whose sum is σ = 32325120. Its totient is φ = 9697500.

The previous prime is 20472533. The next prime is 20472559. The reversal of 20472538 is 83527402.

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

It is a super-2 number, since 2×20472538² = 838249624322888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20472533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269338 + ... + 269413.

It is an arithmetic number, because the mean of its divisors is an integer number (4040640).

Almost surely, 2^20472538 is an apocalyptic number.

20472538 is a deficient number, since it is larger than the sum of its proper divisors (11852582).

20472538 is a wasteful number, since it uses less digits than its factorization.

20472538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538772.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 20472538 is about 4524.6588821700. The cubic root of 20472538 is about 273.5629186804.

The spelling of 20472538 in words is "twenty million, four hundred seventy-two thousand, five hundred thirty-eight".