20706040 has 32 divisors (see below), whose sum is σ = 47472480. Its totient is φ = 8125312.

The previous prime is 20706031. The next prime is 20706061. The reversal of 20706040 is 4060702.

It is a junction number, because it is equal to n+sod(n) for n = 20705999 and 20706017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2764 + ... + 7003.

It is an arithmetic number, because the mean of its divisors is an integer number (1483515).

Almost surely, 2^20706040 is an apocalyptic number.

20706040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20706040 is an abundant number, since it is smaller than the sum of its proper divisors (26766440).

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

20706040 is a wasteful number, since it uses less digits than its factorization.

20706040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9831 (or 9827 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20706040 is about 4550.3889943608. The cubic root of 20706040 is about 274.5990410172.

Adding to 20706040 its reverse (4060702), we get a palindrome (24766742).

The spelling of 20706040 in words is "twenty million, seven hundred six thousand, forty".