20701021 has 8 divisors (see below), whose sum is σ = 22953888. Its totient is φ = 18510000.

The previous prime is 20701001. The next prime is 20701027. The reversal of 20701021 is 12010702.

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

It is a cyclic number.

It is not a de Polignac number, because 20701021 - 2¹³ = 20692829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20700992 and 20701010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20701027) 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, 14755 + ... + 16096.

It is an arithmetic number, because the mean of its divisors is an integer number (2869236).

Almost surely, 2^20701021 is an apocalyptic number.

It is an amenable number.

20701021 is a deficient number, since it is larger than the sum of its proper divisors (2252867).

20701021 is a wasteful number, since it uses less digits than its factorization.

20701021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30923.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 20701021 is about 4549.8374696246. The cubic root of 20701021 is about 274.5768522588.

Adding to 20701021 its reverse (12010702), we get a palindrome (32711723).

The spelling of 20701021 in words is "twenty million, seven hundred one thousand, twenty-one".