20485740 has 48 divisors (see below), whose sum is σ = 62576640. Its totient is φ = 4966080.

The previous prime is 20485739. The next prime is 20485757. The reversal of 20485740 is 4758402.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 20485698 and 20485707.

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, 14860 + ... + 16179.

It is an arithmetic number, because the mean of its divisors is an integer number (1303680).

Almost surely, 2^20485740 is an apocalyptic number.

20485740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20485740 is an abundant number, since it is smaller than the sum of its proper divisors (42090900).

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

20485740 is a wasteful number, since it uses less digits than its factorization.

20485740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31062 (or 31060 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 20485740 is about 4526.1175415581. The cubic root of 20485740 is about 273.6217096586.

The spelling of 20485740 in words is "twenty million, four hundred eighty-five thousand, seven hundred forty".