20913420 has 48 divisors (see below), whose sum is σ = 63883008. Its totient is φ = 5069760.

The previous prime is 20913419. The next prime is 20913421. The reversal of 20913420 is 2431902.

It is an interprime number because it is at equal distance from previous prime (20913419) and next prime (20913421).

It is a super-2 number, since 2×20913420² = 874742272192800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20913421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15184 + ... + 16503.

It is an arithmetic number, because the mean of its divisors is an integer number (1330896).

Almost surely, 2^20913420 is an apocalyptic number.

20913420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20913420 is an abundant number, since it is smaller than the sum of its proper divisors (42969588).

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

20913420 is a wasteful number, since it uses less digits than its factorization.

20913420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31710 (or 31708 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 20913420 is about 4573.1192855643. The cubic root of 20913420 is about 275.5127403658.

The spelling of 20913420 in words is "twenty million, nine hundred thirteen thousand, four hundred twenty".