15420220 has 12 divisors (see below), whose sum is σ = 32382504. Its totient is φ = 6168080.

The previous prime is 15420211. The next prime is 15420221. The reversal of 15420220 is 2202451.

It is a junction number, because it is equal to n+sod(n) for n = 15420194 and 15420203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15420221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385486 + ... + 385525.

It is an arithmetic number, because the mean of its divisors is an integer number (2698542).

Almost surely, 2^15420220 is an apocalyptic number.

15420220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15420220 is an abundant number, since it is smaller than the sum of its proper divisors (16962284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15420220 is a wasteful number, since it uses less digits than its factorization.

15420220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771020 (or 771018 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 15420220 is about 3926.8587955260. The cubic root of 15420220 is about 248.9030336998.

Adding to 15420220 its reverse (2202451), we get a palindrome (17622671).

The spelling of 15420220 in words is "fifteen million, four hundred twenty thousand, two hundred twenty".