15220023 has 32 divisors (see below), whose sum is σ = 25191936. Its totient is φ = 7959168.

The previous prime is 15220013. The next prime is 15220031. The reversal of 15220023 is 32002251.

It is not a de Polignac number, because 15220023 - 2²¹ = 13122871 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15219984 and 15220011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15220003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53640 + ... + 53922.

It is an arithmetic number, because the mean of its divisors is an integer number (787248).

Almost surely, 2^15220023 is an apocalyptic number.

15220023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

15220023 is a deficient number, since it is larger than the sum of its proper divisors (9971913).

15220023 is a wasteful number, since it uses less digits than its factorization.

15220023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 15220023 is about 3901.2847883742. The cubic root of 15220023 is about 247.8211889607.

Adding to 15220023 its reverse (32002251), we get a palindrome (47222274).

The spelling of 15220023 in words is "fifteen million, two hundred twenty thousand, twenty-three".