20772638 has 8 divisors (see below), whose sum is σ = 31248288. Its totient is φ = 10356544.

The previous prime is 20772607. The next prime is 20772641. The reversal of 20772638 is 83627702.

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 = 20772598 and 20772607.

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, 14006 + ... + 15417.

It is an arithmetic number, because the mean of its divisors is an integer number (3906036).

Almost surely, 2^20772638 is an apocalyptic number.

20772638 is a deficient number, since it is larger than the sum of its proper divisors (10475650).

20772638 is a wasteful number, since it uses less digits than its factorization.

20772638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29778.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 20772638 is about 4557.7009555257. The cubic root of 20772638 is about 274.8931287207.

The spelling of 20772638 in words is "twenty million, seven hundred seventy-two thousand, six hundred thirty-eight".