20421458 has 16 divisors (see below), whose sum is σ = 31574616. Its totient is φ = 9901440.

The previous prime is 20421451. The next prime is 20421487. The reversal of 20421458 is 85412402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10543009 + 9878449 = 3247^2 + 3143^2 .

It is not an unprimeable number, because it can be changed into a prime (20421451) 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, 7760 + ... + 10052.

Almost surely, 2^20421458 is an apocalyptic number.

20421458 is a deficient number, since it is larger than the sum of its proper divisors (11153158).

20421458 is a wasteful number, since it uses less digits than its factorization.

20421458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2429.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 20421458 is about 4519.0107324502. The cubic root of 20421458 is about 273.3352115014.

The spelling of 20421458 in words is "twenty million, four hundred twenty-one thousand, four hundred fifty-eight".