20420746 has 8 divisors (see below), whose sum is σ = 30729924. Its totient is φ = 10177440.

The previous prime is 20420681. The next prime is 20420759. The reversal of 20420746 is 64702402.

It can be written as a sum of positive squares in 2 ways, for example, as 18584721 + 1836025 = 4311^2 + 1355^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 20420746.

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, 15685 + ... + 16936.

Almost surely, 2^20420746 is an apocalyptic number.

20420746 is a deficient number, since it is larger than the sum of its proper divisors (10309178).

20420746 is a wasteful number, since it uses less digits than its factorization.

20420746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32936.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 20420746 is about 4518.9319534598. The cubic root of 20420746 is about 273.3320348276.

The spelling of 20420746 in words is "twenty million, four hundred twenty thousand, seven hundred forty-six".