20349720 has 48 divisors (see below), whose sum is σ = 66137760. Its totient is φ = 5426496.

The previous prime is 20349683. The next prime is 20349737. The reversal of 20349720 is 2794302.

It is a super-2 number, since 2×20349720² = 828222208156800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27904 + ... + 28623.

It is an arithmetic number, because the mean of its divisors is an integer number (1377870).

Almost surely, 2^20349720 is an apocalyptic number.

20349720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20349720 is an abundant number, since it is smaller than the sum of its proper divisors (45788040).

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

20349720 is a wasteful number, since it uses less digits than its factorization.

20349720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56544 (or 56537 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20349720 is about 4511.0663927723. The cubic root of 20349720 is about 273.0147719737.

The spelling of 20349720 in words is "twenty million, three hundred forty-nine thousand, seven hundred twenty".