20297620 has 24 divisors (see below), whose sum is σ = 48714624. Its totient is φ = 6959136.

The previous prime is 20297611. The next prime is 20297621. The reversal of 20297620 is 2679202.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20297621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72352 + ... + 72631.

It is an arithmetic number, because the mean of its divisors is an integer number (2029776).

Almost surely, 2^20297620 is an apocalyptic number.

20297620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20297620 is an abundant number, since it is smaller than the sum of its proper divisors (28417004).

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

20297620 is a wasteful number, since it uses less digits than its factorization.

20297620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144999 (or 144997 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 20297620 is about 4505.2880041125. The cubic root of 20297620 is about 272.7815791519.

The spelling of 20297620 in words is "twenty million, two hundred ninety-seven thousand, six hundred twenty".