20145502 has 16 divisors (see below), whose sum is σ = 32804352. Its totient is φ = 9223200.

The previous prime is 20145487. The next prime is 20145509. The reversal of 20145502 is 20554102.

It is a self number, because there is not a number n which added to its sum of digits gives 20145502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20145509) 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, 252 + ... + 6352.

It is an arithmetic number, because the mean of its divisors is an integer number (2050272).

Almost surely, 2^20145502 is an apocalyptic number.

20145502 is a deficient number, since it is larger than the sum of its proper divisors (12658850).

20145502 is a wasteful number, since it uses less digits than its factorization.

20145502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6243.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 20145502 is about 4488.3740931433. The cubic root of 20145502 is about 272.0984271091.

Adding to 20145502 its reverse (20554102), we get a palindrome (40699604).

The spelling of 20145502 in words is "twenty million, one hundred forty-five thousand, five hundred two".