20663734 has 16 divisors (see below), whose sum is σ = 38148768. Its totient is φ = 8174592.

The previous prime is 20663719. The next prime is 20663737. The reversal of 20663734 is 43736602.

It is a junction number, because it is equal to n+sod(n) for n = 20663696 and 20663705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20663737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56587 + ... + 56950.

It is an arithmetic number, because the mean of its divisors is an integer number (2384298).

Almost surely, 2^20663734 is an apocalyptic number.

20663734 is a deficient number, since it is larger than the sum of its proper divisors (17485034).

20663734 is a wasteful number, since it uses less digits than its factorization.

20663734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113559.

The product of its (nonzero) digits is 18144, while the sum is 31.

The square root of 20663734 is about 4545.7380038889. The cubic root of 20663734 is about 274.4118958172.

The spelling of 20663734 in words is "twenty million, six hundred sixty-three thousand, seven hundred thirty-four".