20420719 has 8 divisors (see below), whose sum is σ = 22353408. Its totient is φ = 18500760.

The previous prime is 20420681. The next prime is 20420759. The reversal of 20420719 is 91702402.

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

It is a cyclic number.

It is not a de Polignac number, because 20420719 - 2⁷ = 20420591 is a prime.

It is a super-2 number, since 2×20420719² = 834011528953922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20420693 and 20420702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20420759) 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, 354 + ... + 6400.

It is an arithmetic number, because the mean of its divisors is an integer number (2794176).

Almost surely, 2^20420719 is an apocalyptic number.

20420719 is a deficient number, since it is larger than the sum of its proper divisors (1932689).

20420719 is a wasteful number, since it uses less digits than its factorization.

20420719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6365.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 20420719 is about 4518.9289660272. The cubic root of 20420719 is about 273.3319143624.

The spelling of 20420719 in words is "twenty million, four hundred twenty thousand, seven hundred nineteen".