20273421 has 8 divisors (see below), whose sum is σ = 30892864. Its totient is φ = 11584800.

The previous prime is 20273417. The next prime is 20273431. The reversal of 20273421 is 12437202.

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

It is not a de Polignac number, because 20273421 - 2² = 20273417 is a prime.

It is a super-2 number, since 2×20273421² = 822023198086482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 965401 = 20273421 / (2 + 0 + 2 + 7 + 3 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20273431) 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, 482680 + ... + 482721.

It is an arithmetic number, because the mean of its divisors is an integer number (3861608).

Almost surely, 2^20273421 is an apocalyptic number.

20273421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20273421 is a deficient number, since it is larger than the sum of its proper divisors (10619443).

20273421 is an equidigital number, since it uses as much as digits as its factorization.

20273421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965411.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20273421 is about 4502.6015813083. The cubic root of 20273421 is about 272.6731318488.

The spelling of 20273421 in words is "twenty million, two hundred seventy-three thousand, four hundred twenty-one".