20510102 has 4 divisors (see below), whose sum is σ = 30765156. Its totient is φ = 10255050.

The previous prime is 20510071. The next prime is 20510137. The reversal of 20510102 is 20101502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20101502 = 2 ⋅10050751.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5127524 + ... + 5127527.

It is an arithmetic number, because the mean of its divisors is an integer number (7691289).

Almost surely, 2^20510102 is an apocalyptic number.

20510102 is a deficient number, since it is larger than the sum of its proper divisors (10255054).

20510102 is a wasteful number, since it uses less digits than its factorization.

20510102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10255053.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 20510102 is about 4528.8080109450. The cubic root of 20510102 is about 273.7301319303.

Adding to 20510102 its reverse (20101502), we get a palindrome (40611604).

The spelling of 20510102 in words is "twenty million, five hundred ten thousand, one hundred two".