20720877 has 8 divisors (see below), whose sum is σ = 28580640. Its totient is φ = 13337520.

The previous prime is 20720789. The next prime is 20720893. The reversal of 20720877 is 77802702.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20720877 - 2²³ = 12332269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20727877) 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, 118999 + ... + 119172.

It is an arithmetic number, because the mean of its divisors is an integer number (3572580).

Almost surely, 2^20720877 is an apocalyptic number.

It is an amenable number.

20720877 is a deficient number, since it is larger than the sum of its proper divisors (7859763).

20720877 is a wasteful number, since it uses less digits than its factorization.

20720877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238203.

The product of its (nonzero) digits is 10976, while the sum is 33.

The square root of 20720877 is about 4552.0190025965. The cubic root of 20720877 is about 274.6646137233.

The spelling of 20720877 in words is "twenty million, seven hundred twenty thousand, eight hundred seventy-seven".