20020715 has 16 divisors (see below), whose sum is σ = 28226016. Its totient is φ = 13440000.

The previous prime is 20020711. The next prime is 20020723. The reversal of 20020715 is 51702002.

It is not a de Polignac number, because 20020715 - 2² = 20020711 is a prime.

It is a super-2 number, since 2×20020715² = 801658058222450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20020693 and 20020702.

It is not an unprimeable number, because it can be changed into a prime (20020711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13286 + ... + 14715.

It is an arithmetic number, because the mean of its divisors is an integer number (1764126).

Almost surely, 2^20020715 is an apocalyptic number.

20020715 is a deficient number, since it is larger than the sum of its proper divisors (8205301).

20020715 is a wasteful number, since it uses less digits than its factorization.

20020715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28030.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 20020715 is about 4474.4513630165. The cubic root of 20020715 is about 271.5354445911.

Adding to 20020715 its reverse (51702002), we get a palindrome (71722717).

The spelling of 20020715 in words is "twenty million, twenty thousand, seven hundred fifteen".