20122440 has 64 divisors (see below), whose sum is σ = 65016000. Its totient is φ = 4952832.

The previous prime is 20122429. The next prime is 20122469. The reversal of 20122440 is 4422102.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4890 + ... + 8009.

It is an arithmetic number, because the mean of its divisors is an integer number (1015875).

Almost surely, 2^20122440 is an apocalyptic number.

20122440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20122440 is an abundant number, since it is smaller than the sum of its proper divisors (44893560).

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

20122440 is a wasteful number, since it uses less digits than its factorization.

20122440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12926 (or 12922 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 20122440 is about 4485.8042757124. The cubic root of 20122440 is about 271.9945572729.

Adding to 20122440 its reverse (4422102), we get a palindrome (24544542).

The spelling of 20122440 in words is "twenty million, one hundred twenty-two thousand, four hundred forty".