20472579 has 12 divisors (see below), whose sum is σ = 30591600. Its totient is φ = 13177584.

The previous prime is 20472559. The next prime is 20472583. The reversal of 20472579 is 97527402.

It is a de Polignac number, because none of the positive numbers 2^k-20472579 is a prime.

It is a super-2 number, since 2×20472579² = 838252981822482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20472559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38959 + ... + 39480.

It is an arithmetic number, because the mean of its divisors is an integer number (2549300).

Almost surely, 2^20472579 is an apocalyptic number.

20472579 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20472579 is a deficient number, since it is larger than the sum of its proper divisors (10119021).

20472579 is a wasteful number, since it uses less digits than its factorization.

20472579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78474 (or 78471 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 20472579 is about 4524.6634128960. The cubic root of 20472579 is about 273.5631013002.

The spelling of 20472579 in words is "twenty million, four hundred seventy-two thousand, five hundred seventy-nine".