20842407 has 8 divisors (see below), whose sum is σ = 30877680. Its totient is φ = 13894920.

The previous prime is 20842397. The next prime is 20842421. The reversal of 20842407 is 70424802.

It is not a de Polignac number, because 20842407 - 2⁶ = 20842343 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 771941 = 20842407 / (2 + 0 + 8 + 4 + 2 + 4 + 0 + 7).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20842007) 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, 385944 + ... + 385997.

It is an arithmetic number, because the mean of its divisors is an integer number (3859710).

Almost surely, 2^20842407 is an apocalyptic number.

20842407 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20842407 is a deficient number, since it is larger than the sum of its proper divisors (10035273).

20842407 is an equidigital number, since it uses as much as digits as its factorization.

20842407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771950 (or 771944 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 20842407 is about 4565.3485080550. The cubic root of 20842407 is about 275.2005457261.

The spelling of 20842407 in words is "twenty million, eight hundred forty-two thousand, four hundred seven".