21074020 has 24 divisors (see below), whose sum is σ = 48279168. Its totient is φ = 7663200.

The previous prime is 21073991. The next prime is 21074023. The reversal of 21074020 is 2047012.

It is a super-2 number, since 2×21074020² = 888228637920800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21073985 and 21074003.

It is not an unprimeable number, because it can be changed into a prime (21074023) 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, 47676 + ... + 48115.

It is an arithmetic number, because the mean of its divisors is an integer number (2011632).

Almost surely, 2^21074020 is an apocalyptic number.

21074020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21074020 is an abundant number, since it is smaller than the sum of its proper divisors (27205148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21074020 is a wasteful number, since it uses less digits than its factorization.

21074020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95811 (or 95809 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 21074020 is about 4590.6448348789. The cubic root of 21074020 is about 276.2161892241.

The spelling of 21074020 in words is "twenty-one million, seventy-four thousand, twenty".