20021024 has 12 divisors (see below), whose sum is σ = 39416454. Its totient is φ = 10010496.

The previous prime is 20021021. The next prime is 20021059. The reversal of 20021024 is 42012002.

It can be written as a sum of positive squares in only one way, i.e., 11424400 + 8596624 = 3380^2 + 2932^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20020996 and 20021014.

It is not an unprimeable number, because it can be changed into a prime (20021021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312797 + ... + 312860.

Almost surely, 2^20021024 is an apocalyptic number.

It is an amenable number.

20021024 is a deficient number, since it is larger than the sum of its proper divisors (19395430).

20021024 is an equidigital number, since it uses as much as digits as its factorization.

20021024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625667 (or 625659 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 20021024 is about 4474.4858922562. The cubic root of 20021024 is about 271.5368415446.

Adding to 20021024 its reverse (42012002), we get a palindrome (62033026).

The spelling of 20021024 in words is "twenty million, twenty-one thousand, twenty-four".