20494647 has 16 divisors (see below), whose sum is σ = 30792960. Its totient is φ = 13469400.

The previous prime is 20494603. The next prime is 20494651. The reversal of 20494647 is 74649402.

20494647 is a `hidden beast` number, since 2 + 0 + 4 + 9 + 4 + 647 = 666.

It is not a de Polignac number, because 20494647 - 2⁷ = 20494519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20494667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3429 + ... + 7262.

It is an arithmetic number, because the mean of its divisors is an integer number (1924560).

Almost surely, 2^20494647 is an apocalyptic number.

20494647 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20494647 is a deficient number, since it is larger than the sum of its proper divisors (10298313).

20494647 is a wasteful number, since it uses less digits than its factorization.

20494647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10771 (or 10765 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 20494647 is about 4527.1013905147. The cubic root of 20494647 is about 273.6613599298.

The spelling of 20494647 in words is "twenty million, four hundred ninety-four thousand, six hundred forty-seven".