20720367 has 28 divisors (see below), whose sum is σ = 31836904. Its totient is φ = 13471920.

The previous prime is 20720363. The next prime is 20720417. The reversal of 20720367 is 76302702.

It is not a de Polignac number, because 20720367 - 2² = 20720363 is a prime.

It is a super-4 number, since 4×20720367⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20720367.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20720363) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 31017 + ... + 31677.

Almost surely, 2^20720367 is an apocalyptic number.

20720367 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20720367 is a deficient number, since it is larger than the sum of its proper divisors (11116537).

20720367 is an frugal number, since it uses more digits than its factorization.

20720367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722 (or 707 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 20720367 is about 4551.9629831535. The cubic root of 20720367 is about 274.6623602777.

The spelling of 20720367 in words is "twenty million, seven hundred twenty thousand, three hundred sixty-seven".